Author Topic: CB750 AHRMA Sportsman 750 Racer  (Read 51485 times)

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Offline bwaller

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1025 on: August 16, 2019, 09:47:23 am »
I always find a little extra play at the lever after a race, normal me thinks.

Just throwing this out there.....if there are only a couple modified parts from stock, replace them with stock for a race to see if there's a difference.

I've made a bunch of changes with primary drive and clutches and yes there are teething issues.  ;D Hang in there, you'll get it sorted.

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Little Tally
« Reply #1026 on: September 11, 2019, 10:59:29 am »
Back from Little Tally, the second to last race of the 2019 season, with only the big show at Barber to go. I am solidly in 2nd place in points so feeling pretty damn good any way the next month goes.

Tally was the bro trip my brother and I had been planning all season. Burning fuel at an alarming rate (about 9.5mpg towing the trailer) we stopped a total of 14 times for gas in a 1550 mile journey. But we still had time to hit a favorite brewery of ours in Nashville on Thursday night. Arriving a little before dark, we got all set up and headed to bed.

Friday came nice an early and we were up and through tech in no time (1 tech all weekend now instead of 1 each day). He was practice group 2 and I was 3. He has been fighting ignition issues all year related to the battery and is now on a self-generating PVL system, which ran flawlessly all weekend.

I was hopeful of the new clutch fixing my woes but as the weekend wore on, the clutch loosening continued, though I never did miss a shift because of it. I have a Pro Taper Profile clutch perch on the way to try, so I can adjust on the fly via a large thumb wheel. I found that getting the bike hot in a scrub lap right before the race allowed me to pull a bit more free play out and I was good through the race. That is a bandaid and not something I wan to continue, but I only need to make it through Barber before the engine comes down to every nut and bolt for a look over.

Practice sessions on Friday delivered lap times below my race times of last year, which makes me quite happy, and of course there is always more to be had during the race.

My first race on Saturday was my bump class into Formula Vintage. Bike classes include Sportsman 750, Formula 500, Formula 750, Vintage Superbike Heavyweight, and some fast 2 stroke machines. I was running with a more modern RZ350 and a guy on a CB900F, both of which are AHRMA champions multiple times over. I thought I pulled out a 3rd on Saturday but the guy in 1st was so far ahead we never saw him. Apparently an ex-pro and a Schwantz racing school instructor. Go figure.

My class, sadly, only included me both days, so all I had to do was not f*ck up and I would get my 1000 points per win. And I did just that, working more on technique than all out racing and feeling good about it. That fact was the biggest reason I bumped classes, so I didnt drive 1500 miles with no one to race.

The awards ceremony on Saturday was my brother's first wood and was pretty pumped. It was awesome to be there to share that moment with him.

Sunday came and it was a near facsimile of the Saturday session, though slightly more bearable heat wise, but still running right around 95 all day long. I placed 4th in Formula Vintage again, 1st in S750 (duh) and my brother grabbed another 3rd.

Beer + bikes = happiness:


Your boy in his new Honda hat:


Nice right side shot of my at speed, which I have so few of:


Its the wood that makes it good:




A laundry list of items to take care of before Barber sits in front of me, including going back to my Conti 3CR tires, engine maintenance and a few other items.

22 days...
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 dragracer

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Re: CB750 AHRMA Sportsman 750 Racer - Little Tally
« Reply #1027 on: September 11, 2019, 12:00:06 pm »
Now that's what I call an outstanding weekend.  Spending time with your brother is priceless and placing for both of you is an added bonus. I'm working on a bike right now for my older brother to race so we can spend a little more time hanging out together.  Nothing like family unity when you combine it with our passion for racing.

Offline gschuld

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Re: CB750 AHRMA Sportsman 750 Racer - Little Tally
« Reply #1028 on: September 12, 2019, 07:23:07 am »
Now that's what I call an outstanding weekend.  Spending time with your brother is priceless and placing for both of you is an added bonus. I'm working on a bike right now for my older brother to race so we can spend a little more time hanging out together.  Nothing like family unity when you combine it with our passion for racing.

That’s great Matt.  Good to bond with family, even better when doing an activity you both enjoy.

George

Offline RAF122S

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Re: CB750 AHRMA Sportsman 750 Racer - Little Tally
« Reply #1029 on: September 12, 2019, 11:50:25 am »
Great news on a great weekend racing. Hope the trip to Barber and the racing goes well for you.
David
David stuck in the curvy back roads of "Upper East" TN

Offline MRieck

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Re: CB750 AHRMA Sportsman 750 Racer - Little Tally
« Reply #1030 on: September 13, 2019, 04:10:38 am »
Yes......good luck at Barber.
Owner of the "Million Dollar CB"

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Little Tally
« Reply #1031 on: September 13, 2019, 06:19:41 am »
Thanks guys! Im really looking forward to the new race surface and all the fun Barber has to offer.

Yes......good luck at Barber.
Thanks Mike. The head will be coming your way for a look over just to make sure its good for another couple years of racing duty. Hopefully you can pencil me in during the offseason.
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 MRieck

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Re: CB750 AHRMA Sportsman 750 Racer - Little Tally
« Reply #1032 on: September 13, 2019, 10:45:51 am »
Thanks guys! Im really looking forward to the new race surface and all the fun Barber has to offer.

Yes......good luck at Barber.
Thanks Mike. The head will be coming your way for a look over just to make sure its good for another couple years of racing duty. Hopefully you can pencil me in during the offseason.
I look forward to it. ;)
Owner of the "Million Dollar CB"

Offline CBJoe

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Re: CB750 AHRMA Sportsman 750 Racer - Little Tally
« Reply #1033 on: October 08, 2019, 05:22:48 pm »
Hey Matt...nice meeting you (though briefly) how were your overall results at Barber?  Jerry, Dennis and I were cheering you along one of the turns Saturday

'07 Bonneville Black
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CB750K2 Hot Rod Revival http://forums.sohc4.net/index.php/topic,171693.0.html
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'66 CM91 (C90'ish)

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1034 on: October 11, 2019, 08:15:51 am »
Welcome back race fans! The 2019 season is officially closed out and the results are in! I finished 2nd place in points in the Sportsman 750 class. I ran 12 races this year, visiting Roebling, NOLA, Road America, Gingerman, Talladega and Barber in the process. It has been a great 2019 and of course I am already prepping for the start of the 2020 race season, a short 5 months away.

Barber was a great time and always brings out the best in every rider and every machine, and this year was no different. I practiced Thursday so I had time to enjoy the swap meet on Friday but had enough time on track to feel really good about my prospects. It turns out that I had rear shock springs twice as stiff as was needed (they had apparently been built with side by side springs) and after lunch on Thursday, I got swapped to the correct 2.2kg springs from the original 4.5kg springs by Matt at Race Tech. He is a really stand up guy and helped get the rear dialed in. The last 2 sessions of the day were on new springs and the bike certainly felt more compliant and did a nice job of soaking up the bumps (though on the fresh tarmac, they were few and far between).

I was race 16 of 18 both days, so there wasnt much to do but wait around. Still having some clutch issues, I made a move to get the bike good and hot, then tune the clutch so there was less to worry about during the race. It seemed to work well both days, with only hints of clutch issues rather than fighting it every lap. That will hopefully all be corrected during my full tear down which starts very soon.

Race time on Saturday was really exciting with everyone getting ready to finish strong for the season. I was on the front row based on points, and got my typical slow start, and by T1 was near the back of the field but once I get going, the Honda 750 power started to shine strong. I was able to make my way up to a battle between two strong guys, one on a Yamaha XS and another on a Triumph triple, both very fast. As I was working on the Triumph I was passed by the XS and now had 2 guys to make it through to get on the podium. I eventually made a few choiceful passes and locked in my 3rd place, though both finished only a couple seconds behind me. Nothing like knowing you are being hunted to make times drop! 1:52 lap times in practice (about 4 seconds faster than race times last year) made way for times in the 1:50 range.

The clear skies of Saturday left to allow the first rain on the new track to come our way. We dealt with rain for most of the evening and it resulted in some slick conditions for the first half of Sunday. My race, being later in the day allowed lots of rubber to be laid down and made for some very sticky track conditions, perfect for going fast!

Race time on Sunday was similar to Saturday, with a few warm up laps to get the clutch hot and adjusted. I had a far better start on Sunday and found myself mid field as we exited T1, mixing it up with the Motard guys that were in our wave. I need to be more aggressive with my passing as I felt I lost time trying to get around some of those guys. I was half way through the race in a solid 3rd place when going through T2 I heard the most awful bolts in a tin can noise and chose (wisely) to pull off the track and get out of the way. As it turned out the #2 place racer had pulled off with a mechanical so I was actually in 2nd! Oh well, that's the race game. I have not been inside but I suspect it was a tappet adjuster nut that came loose as I head the same noise after a quick fire up in the pits. Hopefully it didn't do too much damage inside there but we will have to wait and see.

The drive home was uneventful but I have started formulating all my thoughts and tasks on what to get done before next season.

The list:
Head checked over by Mike Rieck
Install new primary chain tensioner
Install new trans, primary gear and clutch hub
Revise breather for engine so I can remove the carb bowls without removing the breather lines
Mount new seat
New magneto ignition, then I can ditch the battery and extra wiring
Paint bodywork
New front brake rotor (found a few cracks between holes after Barber)
One piece front rotor carrier
100 other little things I can't remember right now

Waiting for the 2020 schedule to come out then the official countdown begins!
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

Online turboguzzi

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1035 on: October 12, 2019, 12:13:27 am »
Good to hear you finished 2019 all in one piece, even if bike not quite so :) , congrats!
Needles to say, a loose tappet nut is something that shouldn't happen... ditto for your clutch issues. so go find the root case before jumping on other improvements. having no DNFs is more important than any 0.1 sec you shave through upgrades.

 

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Honda