Author Topic: CB750 AHRMA Sportsman 750 Racer  (Read 171341 times)

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Offline Rocketman

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1150 on: March 23, 2021, 07:25:30 PM »
Great way to start the season. Hope Sunday went as well for you.

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1151 on: March 24, 2021, 09:01:41 AM »
Hey guys, thank you so much for all the support. It really is amazing to have a community of people who love to see these bikes on the track being pushed to the limit.

George did a great synopsis of the weekend. It was cold most of the weekend aside from Sunday afternoon, so it was as much about keeping the tires warm as keeping the rider warm! There were a ton of red flags on the track, actually more than checkered flags in fact. My second race (S750) on Saturday had 2 restarts from riders crashing on cold tires. I don't mean to bash modern bikes, but they were the ones on the ground from what I saw. I really think it was a matter of their tires needing to have a hotter temp to stick properly than our vintage tires, which are far more forgiving to a cold track than modern ones.

I got a set of warmers for my birthday last year and finally got to play with them. Many vintage guys still don't use them and I don't want to get a false sense of security from them, so taking their use with a BIG grain of salt, but it was nice to get some heat into them before going out for a warm up lap.

Aside from the red flags in practice and racing most of the weekend I spent on the track, my racing was clean and I had a chance to battle with a number of guys in Formula 750 and Vintage Superbike Heavyweight.

Formula Vintage is a bump class for a number of classes, including S750, F750, F500, Open 2-stroke, Vintage Superbike Heavyweight and Vintage Superbike Middleweight, making for some great racing. I registered last for the weekend so started a at the very back of the field on Saturday among a pretty deep field of riders from all the above classes. My starts have gotten markedly better lately and I was able to into T1 ahead of a number of bikes in the field, left with chasing my uncle on his XS650 (750), a CBX, a Z1R and a very fast Ducati TT2. I was able to make a great 2 bike pass at the end of race, overtaking the CBX and my uncle for a 3rd place finish, behind the TT2 and Z1R. It's hard to know on the track exactly where you are but it was great to find that I got my podium finish!

S750 was unfortunately less eventful as my uncle had a valve train issue that cropped up at the finish of Formula Vintage on Saturday, so it was just me in the field for both days. All I had to do was not mess up. Of course on Saturday I was lined up behind the F750 grid and on Sunday a schedule change allowed me to line up behind the Vintage Superbike Heavyweight field, both of which made great races, but I knew that beating any of them meant nothing, so it was for fun and great practice. That said, I finished 3rd in Superbike Heavyweight on Sunday, which made me feel great about future prospects of the new VSH bike build I am working on now, for debut later this year.

Sundays Formula Vintage race had me lined up further into the middle of the field, as points from Saturday adjusted the grid. The Z1R and TT2 scratched for Sunday, but I was still lined up with a GS1000, CBX, a couple other fast KZ1000 bikes and one crazy fast RZ350. Another great start put me toward the front right out of the gate. I was running behind the CBX and a KZ for a while. I couldn't catch the KZ until he bumped his footpeg up and struggle to get it back down, putting him off pace, allowing me and the RZ to pass. The RZ was able to make it around me for the next couple laps, but I kept chasing. I was able to pass him and set my sights on the CBX, which wasn't that far out in front of me. I couldn't convert my 2nd pace to a win, but it felt good to finish that strongly against a field of faster bikes. Handling and late braking allowed me to finish really strong for the weekend.

Weekend tally, 2 wins (S750), and a 2nd and 3rd in Formula Vintage.

AHRMA heads West for the next couple of rounds, meaning that I will be on 8-week hiatus until I hit the track at Heartland Park in Topeka Kansas over Memorial Day Weekend. This will be the first Vintage Motofest for AHRMA in 2021 and will include all disciplines AHRMA has to offer, as well as the debut of vintage drag racing. Road racers drag race for free all weekend so Im looking forward to having some fun on the S750 bike at the drag strip!

The bike doesn't need a damn thing except fresh oil, valve adjustment and new brake pads. It feels good to have a bike that is working so well right out of the gate after a rebuild.

My focus is now turned to the new build, which will hopefully debut at the New Jersey round in late June.

Look at that Subaru World Rally Blue out in the sunshine!


Fresh helmet, leathers and paint!


Saturday's wood (err... plastic)


Me and my crew chief, best friend and rock:


« Last Edit: March 24, 2021, 12:54:56 PM by slikwilli420 »
All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1152 on: March 24, 2021, 09:04:11 AM »
My wife also added the latest installment to her blog, Honda Racers Wife, which is a great read from her perspective.

https://hondaracerwife.wordpress.com/2021/03/22/year-5/?fbclid=IwAR0jDxwagJOLS22H4hKLSi5BcXISzXGQeboWOayJZFvQ84bONG6hDFjzUmE
All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline bwaller

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1153 on: March 24, 2021, 10:01:03 AM »
Yessiree you have to love it when reliability and good preparation pay off.

Offline gschuld

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1154 on: May 30, 2021, 09:27:36 AM »
So today is the second day of racing at AHRMA Topeka Kansas at Heartland Raceway
It seems they are doing a live show:

Not exactly MotoGP level work, but it’s something

Matt had 2 races yesterday.  Sportsman 750 and Formula vintage.

In Sportsman he was also running with the heavyweight superbike class.  Mark Hoyt’s superbike was hurt so it was Will Brint on his CBX and Dennis Parrish on his cb900f for top two of superbike and Jeff Hargis on his SX650 and Matt as top two in Sportsman.

Kansas is a tight track, heavily favoring lighter bikes that corner and brake well over sheer power.

Jeff blasted out first quickly with Matt right behind staying close for the first 2 laps (despite Jeff’s twin being 50+ lb lighter), but Jeff pulled away stretching to perhaps 30 lengths once the 6 lap race was over.  But both of them managed to stay ahead of the cb900f and the CBX.  So basically the finishing order went in direct order of weight, from lightest to heaviest. 

I believe this was the first time Matt had managed to beat Dennis Parrish(cb900f, current superbike champ) straight up.👍. Good confidence booster.

Formula vintage saw a similar result.

Against the super bikes, Matt said he felt he wasn’t overwhelmed by their power on the straights or out of corners(from the superbikes), but he had a big advantage in braking and corner speed they couldn’t make up.

Matt, obviously, is gauging his Sportsman bike performance against the bigger displacement super bikes to see where he thinks he’ll stand against them in his new Superbike build once out on track.  Currently, he is looking great against them on tight tracks(his cb750 based bike is lighter and more nimble), but is at a disadvantage on long fast tracks with lots of room to get up to speed(762cc against 1025cc)

His new superbike will be running a somewhat mild but much larger engine, giving him more HP and torque to keep up with them on faster tracks.

Who knows what will come out in 2022 when its Superbikes big year running under the Vintage Cup banner(a one year only thing meant to boost interest and focus on one particular class per year), as there are some quite fast original AMA Superbike race bikes (and replicas) still out there in racing form with great riders for them.

Joe Weir, Mark Hoyt, Dale Quarterly, Eric Kondo, Tom Dorsey(all recently raced MotoAmerica Heritage Cup events last year) among others.  Time will tell.

Good luck today Matt.




« Last Edit: May 30, 2021, 10:38:19 AM by gschuld »

Offline gschuld

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1155 on: May 30, 2021, 09:40:18 AM »
Oh, Matt and I are super bummed by this, but the new banner was finished up late, the day after Matt and Ashley left for the races.  It will be up at NJMP in June for sure and then after.  It’s 42” tall and 9’6” wide, custom designed to be attached to Matt’s 10x10 pop up tent he uses for his bike.

It’s time to show some love for those who have helped Matt with his racing efforts, for without them, he wouldn’t be able to achieve the racers goal...

...converting money into noise😉

George

Offline gschuld

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1156 on: May 30, 2021, 10:00:57 AM »
FWIW, they had the 2020 championship awards on Friday night, and Matt got his second place trophy for Sportsman 750.  A few points behind his arch enemy and nemesis(and uncle🙄) Jeff Hargis

George

Offline Ramrod_Racing

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1157 on: June 22, 2021, 10:37:50 AM »

I’m sure Matt will have one of his race weekend recaps here before long, but in the mean time here’s some video of our great Formula Vintage race from Sunday. The class is a fun catch-all, thus the race long battle between a Vintage Heavyweight Superbike GS1000, Vintage Superbike Middleweight CB650, Sportsman 750 CB750, and a Formula 500 RD400 (the film bike).

The GS nipped me at the finish by .064
« Last Edit: June 22, 2021, 10:39:29 AM by Ramrod_Racing »

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1158 on: June 26, 2021, 06:22:03 PM »
There has been a ton going on in the shop so updates have had to wait until now. I now have 2 more weekends under my belt, Topeka over Memorial Day weekend and Jersey 6/18-20. Both weekends were filled with awesome close racing and some excellent results for the S750 bike.

Heartland Motorsports Park (Topeka, KS) is an awesome facility. The track surface is very nice, with no gaps or bumps, just a very technical and physical track. Even though I am in far better physical condition that I have been in my adult life, this track was the most challenging circuit I have ever raced. There is no time for rest as the straights are short and there are a number of quick transitions from one side of the bike to the other. Aside from the front straight, there is zero time for rest of your hands anywhere. It was a new track for me so I had double duty of learning the track as well as getting fast enough to be competitive against the top of my class. As usual, times dropped throughout Friday practice and into Saturday morning, and this time my bump class of Formula Vintage was after my main Sportsman 750 class. It can be nice to get some additional race time before my class just to be extra ready to race hard, but in the case of Topeka, it was probably better this was as I was physically exhausted after my S750 race. My uncle Jeff and I definitely make each other faster, and while be both turned some solid lap times Saturday, I was unable to keep his pace and finished a strong 2nd to the rest of the field, turning in a hot lap of 2:01. For whatever reason I didn't have my "game face" on that day and had a long evening to thing about how to best execute my mantra, Do What Jeff Does. My uncle knows how to ride fast and smooth and If I can get in behind him right at the beginning I will be able to keep pace. His strong start on Saturday and my relatively bad one left me in 2nd place.

Sunday would prove different entirely. I was in a different mindset, and I knew that If I wanted to keep my chances of a championship in sight, I needed a win in S750. I chose not to run Formula Vintage on Sunday and instead save my energy and focus for S750. I planned to leave it all out there and go as hard as me and the bike could stand. Sunday practice went well and I was ready for my turn. Race 8 calls begin and its go time. I suit up with a different confidence level today and feel that its my time to shine. I get a hard launch on the green flag and was able to beat Jeff into T1. I struck first and was going to set the pace for our race that day. Jeff was able to make 2-3 passes over the course of the race, but I would immediately pass him into the next corner. I had the acceleration, I had the handling, I had the brakes. It was all working just as planned. I was answering every challenge and continued to tick laps off. White flag. I whisper to myself "don't f*ck up" as I always do on the last lap, although this time, I was out front. No idea how much, but there I was. As I made my way around the last circuit of the course, things were working but I was getting really tired. Im in the back of the course with maybe 4-5 turns left and then it happens. The bike starts to break up coming out of a corner and Im on two cylinders. I apparently almost got rear ended by Jeff as I lose power and he's still charging hard. Then the power comes back, back on 4 cylinders! Then back to two. Jeff passes me as I struggle to keep my composure and push toward the finish. Without full power I can only hope and pray that 2nd place is still in my future. Despite the abysmal last lap running on 2 cylinders part of the time, I still only finished about 3.5 seconds behind Jeff and managed to turn a 1:59.7 as the fast lap and personal best for the whole weekend.

Back in the pits, its Sunday and its time to pack and head home. Spend the next few days focused on the Superbike project for its debut at Jersey, confident (stupid me) that the Dyna S ignition pickup was to blame, so I simply went ahead and ordered new one just in case. Fast forward to some night where I decide its time to get the S750 bike ready for primetime. I replace the ignition, certain that the cause of my issue was the pickup. I go through the full test and troubleshoot section of the Dyna installation guide. Everything is checking out fine on 2/3 but not on 1/4. I continue to do voltage tests and fashion a simple 12v test light to get things moving. The 1/4 does not pass any test, so I begin to look at the coils as that is the only other thing that could cause 2 cylinders to cut out. I determine that the voltage readings for that coil are not good and start to remove it to replace with another good coil. As I take the black wire off the coil terminal, I watch as the ring terminal drops off the wire and bounces on the floor. There it is, my smoking gun. A f*cking 2 cent ring terminal cost me the race. I took a second to curse the Gods of Speed and went about replacing that terminal as well as the one that fed 2/3. Its always the simplest and cheapest things that cause the biggest headache and heartache, but lesson learned, the hard way.

The most beautiful and supportive crew chief and I in our requisite behind the trailer photo on the way to Kansas (plus the young man on his first far-away-from-home race voyage):


A future racer on a well-prepped (or so I thought!) machine:


Yours truly, so close to the top of the box, yet so far away:


Proud boy, proud daddy:


Knucks before go time:


Maid of Honor hardware after a great weekend:


The Honda Racer's Wife recap after Topeka, such a great read and awesome perspective from a different viewpoint: https://hondaracerwife.wordpress.com/2021/05/31/heartland-motorsports-park-topeka-kansas/?fbclid=IwAR1UD1zHGYMao653mg0So0qKMBsoyHDNNiIeGXn-BxyvZXnDZBR4NWwfojc

The weeks in between Kansas and the next round in New Jersey were long, with some days going 16-18 hours, the ultimate sacrifice being time away from my family, in the shop, making the impossible happen. That tale can be found here: http://forums.sohc4.net/index.php/topic,173120.0.html

The trip to Jersey had been originally planned as a blowout week to go and meet George (gschuld here) and soak up the Jersey shore lifestyle in the days before the race. But life moves pretty fast, and things change in a heartbeat. The 2021 whirlwind was not meant to be, so it was our standard leave mid-week and get to the track to be ready for the weekend. More on that adventure in the Superbike thread as well!

Jersey was another new track for me, despite having tried to go the last 3 years leading up to this, but for various reasons, it never materialized. Well, 2021 was my year! Per the usual, times dropped as I got a level of comfort with the track and its specific intricacies. Its a technical circuit, with something for everyone. Enough high speed areas, descending radius turns, a very quick right-left-left-right section which leads into the "hump" which very easily causes the front tire to leave terra firma briefly, and not for the faint of heart. Not nearly as physical as Topeka, but challenging in its own right for a number of reasons. This time, Formula Vintage was 2 races before S750, and earlier in the day, meaning I could be extra frosty for my race, having just come off the track in FV. Knowing FV wasn't my goal, I got decent starts but wasn't able to (chose not to try) to keep pace with the fastest guys, saving the machine and the rider for the real reason I was there, to win some top box points in S750. I was lined up right next to Jeff and ready for the drag race to T1 and the race that would follow. Jeff leads the field with me close behind going into T3/T4 and the bike decides to jump out of gear just before I downshift to enter the corner. Of course that upsets the whole mojo I was trying to get and I took a brief excursion to mow some grass as I watch the whole S750 field pass me. Back on track and in gear, it was time to hunt. I needed to set a pace fast enough to collect 2nd place and stay in th hunt for championship points. Turn after turn, I was able to catch and pass my fellow racers in the S750 class. Finally I came to another top rider, Mike Dixon, who is still very fast and has a ton of experience fending off would be passing. I was able to finally overtake Mike and found myself solidly in 2nd place at the checkers, well behind Jeff. The day was done, what started out pretty rocky recovered well enough to keep the long game within reach.

Sunday, the air is always different for me. I am always more focused and more ready to take on my race. Again, FV was 2 races before S750, but it was hotter on Sunday than the rest of the weekend. I caught a lucky break and lunch was neatly tucked in between my FV and S750 races, giving rider time to hydrate, cool of and refuel, as well as give the machine time to cool. Confidence was high and it was go time. I needed a flawless performance every lap to get the result I was after. I tucked in after the green flag right behind Jeff with a number of F750 competitors mixed among us. We were men possessed, riding laps that matched our F750 counterparts and dicing it up with the slower of the modern bunch even further ahead. Jeff managed to put a few F750 riders between us here and there, and found himself fighting traffic from the other classes, allowing me to stay close. I made my last pass on a rider of another class and was right behind Jeff, keeping acceleration and braking pace with him, inching closer each turn. Then it happened, this time it was his machine that proved uncooperative in the clutch moment. The last lap as we round the last few turns, he actions his foot for a downshift and finds a false neutral. He heads wide through the turn as he tries to find the right gear, opening an every so small window for me. I dive deep and make my pass. Until I saw the GoPro video I had no idea how close he was. I led the last few turns only to later find that he was slightly more than 0.100 seconds behind me at the line. Victory was mine, and so was the retribution of losing the race at Topeka. A mirror image of that race as I set the pace and a mechanical issue costs me the win, while the same happens to Jeff at Jersey.

As we pack up for the ride home, Jeff stops by and offers a sweaty congratulatory hug (family is even thicker than competition) and we say our goodbyes, set to reunite at our home track in South Haven, MI, Gingerman Raceway. The highlight of the season is mere weeks away, and man and machine will need to be tip top. However it shakes out next time, there will be fireworks.

Trailer pic, crew chief by my side:


Saturday's lawn mowing expedition:


Back in the hunt:


Saturday's ceremonies


Lurking:


Still lurking:


At. The. Line.


GoPro footage from the front on Saturday, you can see my boo boo on the first lap, and my ensuing recovery throughout the race:
GoPro footage from the rear on Sunday, the good stuff starts around 10:15

The Honda Racer's Wife recap for Jersey: https://hondaracerwife.wordpress.com/2021/06/21/new-jersey-motorsports-park/?fbclid=IwAR3v94QkeBy2DeFmynPw3Csw6bhNXp6jr2X76_5lO7EbWitGbMNz9zdOZf0
« Last Edit: June 26, 2021, 07:05:33 PM by slikwilli420 »
All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline seanbarney41

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1159 on: June 26, 2021, 08:33:54 PM »
Thanks Matt!  Really appreciate you sharing the videos and write ups.
If it works good, it looks good...

Offline PeWe

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1160 on: June 27, 2021, 12:48:50 AM »
Thanks for the exciting reading that can be an article in a bike/race magazine!
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline simon#42

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1161 on: June 27, 2021, 07:05:27 AM »
i am surprised that you were exhausted after a 5 lap race .  do you tense up when ridding ? 

Offline Rocketman

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1162 on: June 27, 2021, 11:41:35 AM »
I can’t speak for Matt, but it was unusually hot 90F/32C and humid. I’d like to think I’m in reasonable condition as I’m a runner. It’s hard to believe that 40 years ago we ran 50 mile races as novices and 75 to 100 miles as experts. As for me I was exhausted after my second race on Sunday. I weighed myself when I got home and had lost 5 lbs over the weekend. Think it was just a combination of no one but the pro’s do long races so we aren’t used to it and unusual heat.

Offline simon#42

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1163 on: June 27, 2021, 12:19:42 PM »
with respect rocketman you are a lot older , as am i .  normally when i see a rider worn out after a few laps its because they are trying to force it too much . if so there are good gains in performance to be had by recognising it and relaxing .   i know lots of fat middle aged blokes that live on chips and beer but have no problem completing two 6 lap TT races in a day !

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1164 on: June 28, 2021, 06:41:44 AM »
i am surprised that you were exhausted after a 5 lap race .  do you tense up when ridding ?

As Martin noted it was quite warm with high humidity both days. I get faster and smoother every weekend and over time, but with sprint races, the exertion of energy is very condensed, where we are running our hottest laps every single time around the circuit. If I was running 25 laps or an endurance race, my pace would be slightly slower and energy output would be far less. With such short races there isn't really time to settle into a groove and lay down laps, its more about getting out front fast and staying there, pushing yourself every turn since you don't have any time to recover from mistakes or a slow lap.

I will say that extreme temperatures aside, my physical training has made riding the bike fast much easier. A combination of lighter weight and more experience makes for a much more enjoyable time on the track. I used to come off the track sore in my core and legs and would really struggle over the weekend. With time, I am still tired at the end of the weekend but not physically in pain and totally drained like I once was.
All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline simon#42

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1165 on: June 28, 2021, 10:39:55 AM »
you look in much better shape this year . if you ever get the luxury of a practice or track day  try forcing yourself to relax . concentrate on your breathing , pick your braking markers  and your lines and try to repeat them every lap . at no point should you be worried , excited or angry . this is what they teach the young lads coming into the motogp paddock . if your lap times vary by more than quarter a second you get the sack !   . looking at your times i think you could make big gains here , big gains .

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1166 on: June 28, 2021, 11:17:01 AM »
you look in much better shape this year . if you ever get the luxury of a practice or track day  try forcing yourself to relax . concentrate on your breathing , pick your braking markers  and your lines and try to repeat them every lap . at no point should you be worried , excited or angry . this is what they teach the young lads coming into the motogp paddock . if your lap times vary by more than quarter a second you get the sack !   . looking at your times i think you could make big gains here , big gains .

Consistency over the course of the race is definitely key and has gotten better. I thinks its a fools errand to worry about being with a quarter second a lap over the race. I had a look at results of some of the very best guys in the toughest classes and few got to within a second spread in lap times. With so many classes, we are always gridded with "faster" guys in front of us, and end up finding traffic to pass within a few laps which certainly doesn't help with consistent lap times either.
All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline simon#42

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1167 on: June 28, 2021, 01:19:40 PM »
no i agree , it would be hard to get a spread of times that close .  it always surprises me that racers will try everything to improve the bike but tend to get upset if you suggest improving their ridding  . thats not a go at you mat more of a general observation !

Offline bwaller

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1168 on: June 28, 2021, 03:24:05 PM »
There is a lot of truth to this, and I'm certainly not suggesting Matt is over tense. But it's not unusual to see bar grips twisted crazily in the pits. I remember one guy I raced with whose neck veins were visible from ten feet away! Being relaxed is important. Smooth guys are always relaxed.

I understand you have a race date the same weekend as our Mosport event. That's too bad because I was looking forward to seeing you and Martin again.

Offline gschuld

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1169 on: June 28, 2021, 04:38:29 PM »
Brent,

Yea, the Mosport event land on the same weekend as the AHRMA Blackhawk farms race.  Matt needs to be there to make enough AHRMA events for a championship season.

Otherwise, any rational person would rather race at Mosport, and visit you of course.

George


Offline seanbarney41

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1170 on: June 28, 2021, 05:47:32 PM »
no i agree , it would be hard to get a spread of times that close .  it always surprises me that racers will try everything to improve the bike but tend to get upset if you suggest improving their ridding  . thats not a go at you mat more of a general observation !
In the dirt bike world, which consists of much lower speeds but much greater physical exertion, this idea is known as the 80/20 rule...speed is a function of 80 percent rider skill and 20 percent bike mechanical prowess.  It is why my buddy Lucas is always patiently waiting for me at the end of the trail atop his 86 xr250, whule I huff and puff away behind on my 07 crf450.
If it works good, it looks good...

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1171 on: July 15, 2021, 07:39:50 AM »
Focus has been on getting the bikes prepped for the double header weekend of Gingerman and Blackhawk. These are important races for a few reasons. Gingerman is my home track so I have a lot of laps there and its one of my best shots this season to get more points spread between my uncle and me for a shot at the championship. There is still a lot of mountain to climb, but I do need to beat him 3 more times to lock it up. That assumes that all of my other finishes are 2nd to him as well as a pair of wins at Little Tally later this year, where he won't be racing. Blackhawk is a new track to me, having only been there last year, but being after Gingerman will see that I am extra fresh on the bikes and help give me a needed leg up. If it takes less time to get into the groove, I can get faster, faster, if you know what I mean.

The last 2 rounds I have noticed intermittent slipping of the clutch at higher RPM's on the longer straights, so it was time to investigate. Upon pulling the clutch, I found the pack thickness had dropped from the 1.460 stock thickness (early clutch) to around 1.390. That is still larger than the gap between the two inner hubs, but it was clearly time for some rehab. I pulled the pack apart to find that each steel had significant darkening in a 1 inch spot, and the same at 180 degrees from that. Each plate had the same affliction in the same location. I talked to Kenny and we decided to go back to the later clutch (riveted center steel and outermost fiber with wider tabs). The wider tab should help with the pack disengaging more easily and consistently. I originally had the later clutch, and for whatever reason (don't remember why) swapped to the early style when I had him send me a rebuilt and balanced primary hub/clutch basket assembly. In either case, it will have the later clutch, basket and hub installed with additional oiling holes as well as coated steels. This was the only hiccup from the Jersey weekend.

In other news, I finally decided to make my life a bit easier. I have been changing tires 2x a year for one bike (now 2 bikes) and have been using a bead breaker and spoons. Ive gotten better at it but it always includes sweating and swearing. I don't have room for a tire changer in my garage but I did purchase the No Mar changing bar which includes tips for mounting and dismounting. It should keep my rims in much better shape and keep my from doing too much swearing. It should be here today so a full report will be forthcoming.
All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline bwaller

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1172 on: July 17, 2021, 05:06:06 PM »
I hated to say anything but the clutch slippage was pretty obvious in your vids. Hopefully this latest change solves the issue.

A buddy of mine made a beadbreaker that works slick. He always brings it along but I need to make a copy for myself. Anything to speed up the process. I bought an OutEx tube replacement kit for the rear. I'll let you know how that works out. So far so good!

Good luck Matt.

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1173 on: October 14, 2021, 05:20:12 PM »
We did it! We did it! We f*cking did it!! 2021 Sportsman 750 Champion is in the house! I say "we" because an effort like this takes a village. My wife Ashley and son Jackson are my road warriors and personal cheerleaders and have been since this all started in 2017. Bryan at Kalamazoo Waterjet, Kenny at Cycle X for top-shelf parts and sage advice, Mike Rieck for a KILLER head, George for guidance and a general penchant for spending other people's money (and a very good friend to boot!).

Big Bob Burns out of Chicago worked with the rules committee 7 years ago to get provisional status granted to the CB750 for the Sportsman 750 class. I built the bike in 2017 and started racing. 2018 was another partial year but things were moving along. The last 3 years have been increasing effort combined with rider skill, leaving me with the Maid of Honor position in 2020. This year was a full kill effort to climb to the top of the box. I first beat my uncle at our home track, Gingerman, last year and that set the stage for the whole next season. I was riding and winning against the top dogs. The bike fits like a tailored suit, and works like a... well like a Honda should.

The majority of my season this year was heads-up battles with my uncle on his hot XS650 Yamaha. It makes decent power, weighs next to nothing and he knows how to use it like a surgeon uses a scalpel. The seasons exploits up to Tally came before this so read back to catch up on the all that.

Tally was always up in the air for this year. It was going to come down to needing the points to stay ahead of Jeff or not. Well the math wasn't completely in my favor at that point, so Ashely and I hit the road. Tally eats tires like nothing else (its paved with crushed seashells in the aggregate) so I put on a set of used tires I wouldn't race anywhere else but would grip just fine here, just like everyone does.

This game is often a war of attrition and it was on my side. Saturday's melee ended in me on the top step due to some transmission issues my uncle was having.

Sunday was, sadly a bit different. Lap one had my uncle out front and coming into the last corner of lap 1, he lost the front tire and went down, hard. It's not how I wanted to win that day, but that's racing, and he and the bike were mended.

At this point, the season was a lock for me, but how can any sane person miss a chance to race at the real fall classic, Barber Vintage Fest? So back to fresh tires for the smooth as butter surface that is Barber, and off I go.

My uncle's bike was fixed up but he was still not ready for primetime, so his son raced Sunday. I was able to pull out a win Saturday and climb to the top step for the first time at Barber. Sunday my cousin held me to the 2nd rung of the box, but my lap times were blistering fast and it was one of the best races I have been a part of all year.

So, what now? Well, 2022 isn't that far away. I used to think that offseason was some sort of vacation from racing, where in reality, its just a little longer between race rounds. So the engine needs some attention but the rest simply needs a very close look over to be ready to defend the title next year. 2022 is bringing some new tracks to AHRMA, and I plan on making 7 or 8 rounds, giving me plenty of on-track time with a buffer for any boo-boo's that may happen along the way in the run for a back-to-back title hunt.

SOHC Nation representing at Blackhawk Farms with a 1st and a 3rd:




Little Tally action, photo by Kevin McIntosh


Chasing my uncle, and racing with F750's very fast bikes, photo by Kevin McIntosh:


Barber, Saturday night, showing off that top-box wood:
All you gotta do is do what you gotta do.

Vintage Speed Parts Mashup: http://forums.sohc4.net/index.php?topic=133638.0
Rickman CR Parts Kit Refresh: http://forums.sohc4.net/index.php/topic,154837.0.html
AHRMA CB750 Racer: http://forums.sohc4.net/index.php/topic,158461.0.html
AHRMA Superbike Heavyweight Racer: http://forums.sohc4.net/index.php/topic,173120.0.html
'76F CB750 Patina Redemption: http://forums.sohc4.net/index.php/topic,174871.0.html

Offline RAFster122s

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1174 on: October 14, 2021, 05:31:25 PM »
Congratulations! Well deserved and great the family is involved and supporting you!
David- back in the desert SW!