Author Topic: CB750 AHRMA Sportsman 750 Racer  (Read 177719 times)

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Online turboguzzi

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Re: CB750 AHRMA Sportsman 750 Racer - NOLA
« Reply #900 on: March 13, 2019, 11:33:37 AM »
looks like you havent made them public in google

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - NOLA
« Reply #901 on: March 13, 2019, 11:53:50 AM »
Never knew anything but public images. I shared them differently this time so hopefully it works.
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 Tintop

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Re: CB750 AHRMA Sportsman 750 Racer - NOLA
« Reply #902 on: March 13, 2019, 02:54:37 PM »
That worked Matt.  Couldn't see them earlier, but can now. 8)
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Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #903 on: April 03, 2019, 11:47:19 AM »
I have a number of changes being made during my mid-season break, which picks up in late July for a double weekend of Road America and Gingerman.

My original Scitsu tach mount sh*t the bed at NOLA, leaving me with a very floppy tach that was basically unusable, so I cam up with a much more robust version:



You can also see the Speedhut oil pressure gauge in the pic, and I need a few more pieces to mount the sensor then it will be ready to go.

I have also been meaning to add a front fender and had been looking at a few options from Airtech, finally settling on the one below. It will be mounted/painted for good once I pull the front wheel off to swap in my new Conti 3CR tires for the next rounds of racing.



I am also working on a different design of rear set plates that moves the master behind the plate and more out of the way, eliminating the long rod from the lever to master.

My last endeavor is going to be to figure out my transmission issues. At the end of both days racing at NOLA I was having the same shifting issues as I experienced starting at Barber last year. I am going to swap Kenny's 4 plate clutch back in and likely replace the entire trans with a new pro-cut one from him. I still do not understand what would make the clutch lever so loose once the bike was hot, but it was bad enough that to get the best lever possible at NOLA, I took my scrub lap right before my race and got the bike hot, adjusted the lever to almost no perceptible play, and at the end of the race, the ball on the lever was moving at least 1/2" before disengaging the clutch. This really needs to be fixed and for good, as it my have cost me a 2nd place finish at NOLA instead of the 3rd I got. I am open to any ideas that can help me understand my issue.
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 #904 on: April 03, 2019, 02:02:11 PM »
check the diameter of the contis vs the avons. i rmemember having to adjust ride heights a bit when swithcing form avons to conti CR 2s to maintina same setup....

Offline Tintop

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #905 on: April 03, 2019, 03:53:39 PM »
I had a similar clutch issue with the sidecar's engine.  The issue with mine was the cam that pushed the rod had way to much clearance, allowing it to twist before it actually started to do anything.  This got worse as everything heated up during a race.  I ended up changing the clutch actuation mechanism.  I'd check the clearances in the actuation parts.
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline Captain

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #906 on: April 03, 2019, 08:02:21 PM »
Have a close look at the end float of your main shaft and shim it so that the far bearing outer race is snug against the case. This will stop or reduce free play growing with heat.

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Offline scottly

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #907 on: April 03, 2019, 08:12:45 PM »
I still do not understand what would make the clutch lever so loose once the bike was hot, but it was bad enough that to get the best lever possible at NOLA, I took my scrub lap right before my race and got the bike hot, adjusted the lever to almost no perceptible play, and at the end of the race, the ball on the lever was moving at least 1/2" before disengaging the clutch.
After the bike cools off, does the lever go back to almost no perceptible play?
Don't fix it if it ain't broke!
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Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #908 on: April 04, 2019, 05:05:46 AM »
Have a close look at the end float of your main shaft and shim it so that the far bearing outer race is snug against the case. This will stop or reduce free play growing with heat.

Captain

With the shaft being adjustable I simply follow the manual and tighten until resistance the back off a little over half a turn. I could reduce this amount.

I still do not understand what would make the clutch lever so loose once the bike was hot, but it was bad enough that to get the best lever possible at NOLA, I took my scrub lap right before my race and got the bike hot, adjusted the lever to almost no perceptible play, and at the end of the race, the ball on the lever was moving at least 1/2" before disengaging the clutch.
After the bike cools off, does the lever go back to almost no perceptible play?

Yes as it cools the lever tightens back up and if I was too aggressive with my hot adjustment it will be completely tight.
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 754

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #909 on: April 04, 2019, 05:37:53 PM »
 I thought I went by memory and set a new engine up to1/8 or 1/4 turn clearance .. it was not enough , clutch started slipping 2 times before I read the manual and gave it 1/2 turn.  Too tight not good.
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Offline scottly

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #910 on: April 04, 2019, 10:11:06 PM »
I don't use the "tighten the screw until resistance is felt, then back it out xx turns" method anymore. Now, I check the free movement of the lever on the clutch cover with my finger, looking for about 2-3mm. If it needs adjustment, I loosen the locknut, adjust the screw, tighten the locknut, and check again. I've found that play in the hand lever pivot can exaggerate play at the end of the lever ball; with a worn clutch lever pivot hole and bolt, there may be over 1/2" of travel at the ball before the cable even starts to move...
It's curious that your adjustment loosens up with heat? This implies the clutch is moving away from the lifter cam in the clutch cover. Did you modify the cover to remove weight?
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #911 on: April 05, 2019, 05:22:38 AM »
I don't use the "tighten the screw until resistance is felt, then back it out xx turns" method anymore. Now, I check the free movement of the lever on the clutch cover with my finger, looking for about 2-3mm. If it needs adjustment, I loosen the locknut, adjust the screw, tighten the locknut, and check again. I've found that play in the hand lever pivot can exaggerate play at the end of the lever ball; with a worn clutch lever pivot hole and bolt, there may be over 1/2" of travel at the ball before the cable even starts to move...
It's curious that your adjustment loosens up with heat? This implies the clutch is moving away from the lifter cam in the clutch cover. Did you modify the cover to remove weight?

I did modify the cover but didn't remove any material from the ribs. I only removed the thread holes for the chrome cover. If the cover was flexing it should do it all the time. This is also a newer issue that appeared at Barber last year but never before then. Now it's toward the end of every race. The cover had been modified all season last year.
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
« Reply #912 on: June 19, 2019, 11:35:47 AM »
Back at it and prepped for Road America in late July. Its a back to back with Gingerman the weekend after.

I have the new Conti RoadAttack 3CR tires mounted and tried them out at a Gingerman track night last Friday. F*cking tires weigh a ton! The front was over 3lbs heavier than an Avon of the same size and rear was 2.5lb heavier! The tires are so far universally loved, and many with more experience than me either didnt notice or didnt mind the additional weight. Strange, since its the last place you want to add weight on a bike.

I like the feel of the new tires and did maybe 20 or so laps over 3 sessions to get a feel for them. They seem quite sticky and easily on par with the soft compound Avon tires I was running.

I have Kenny's 4 plate clutch in the bike and didnt find it as grabby as he said it might be when new. I changed the cable from a Motion Pro to a far more expensive (hopefully that means better quality) Barnett unit. I did experience the same growing lever free play as I had in the past, but not as bad. There are a couple factors at play. It was only about 79 degrees at the track last Friday, and I often race in temps above 90 degrees. I also didnt push nearly as hard at a local track night as I would chasing points on race day.

When I changed the clutch I inspected the lifter parts with the 3 steel balls and the ramp and adjust screw and all looked good. I used 1/2" turn out from resistance for the adjuster screw but may try and reduce the amount and play with that in practice. I do find that after a warm up session and a hot adjustment it seems better, but if I overdo it then I risk clutch engagement issues. I found that if I am deliberate on shifts I have far less issues, so part of it may come down to technique.

Another thing that popped up was the rear set lever. It is an adjustable lever with a bronze bushing that rides on the shaft of the peg. That area has loosened noticeably since I installed them for the beginning of the 2018 season. I think tightening that up will help some along with a shift rod of stainless steel instead of aluminum, helping eliminate the slop in that system. I may even try a needle bearing in the pivot point and keep it full of grease rather than rely on the bushing.

No other changes for this year, though I have a fresh pro-cut trans with balanced and rebuilt primary wheel ready, and am awaiting the tensioner system from Mirko, along with a different seat and potentially a more ergonomic gas tank that is shorter and narrower in the rear so I can get more weight forward and move from side to side more easily.
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

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #913 on: June 19, 2019, 12:02:05 PM »
problem with all the CR contis is that they are based on a safe road tire and they simply put a differnt compound for racing, but it's essentially a design for street use, two up use with loaded heavy bike... IMHO.

but it's used universally also here, guess people got tried of avon/dulop pricing.

whats the $$$ difference in the usa between CR3 pair and avons?


Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #914 on: June 19, 2019, 12:26:52 PM »
problem with all the CR contis is that they are based on a safe road tire and they simply put a differnt compound for racing, but it's essentially a design for street use, two up use with loaded heavy bike... IMHO.

but it's used universally also here, guess people got tried of avon/dulop pricing.

whats the $$$ difference in the usa between CR3 pair and avons?

Yeah I had heard the 3CR updated the compound slightly and simply changed the tread pattern to get better wet grip. Makes sense that its a road tire adapted to the track though. Supply on Avon and Conti 3CR has gotten spotty of late, but when available the 3CR are about $400 per set. You can find that deal on Avons but not very often, usually closer to $500 per set. I have also talked to guys that get a full season on Conti's while they only get half a season on Avons. That right there makes the real difference, where its now $400 vs $1000 for tires per season. Plenty of AHRMA championships on the 2CR, no reason to think it won't continue with the 3CR's.
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
« Reply #915 on: July 23, 2019, 06:11:41 AM »
Alright race fans, the Road America/Gingerman back to back weekend is upon us! The Mrs. and I are leaving for beautiful cheese country tomorrow afternoon to take in some craft beer and delicious cheese on our way through Milwaukee to Road America. I have not been to a lot of tracks but RA is definitely my favorite. Ive been told this is the place to "let the big dog eat" relative to my bike. It sure does howl something fierce crossing start/finish at 10K running 130, especially against a sea of Yamaha and Triumph twins and the occasional Triumph triple.

Im on the new Conti 3CR for this part of my season, as I transition away from Avon. I will run the 3CR for RA and Gingerman, swap back to my used Avons for Tally (extremely aggressive surface where even worn out tires grip like new) then back to Conti's full time. With the glowing reports of the Conti's, the more competitive cost and better availability its a no brainer, despite being noticeably heavier than Avons. I will also be running my 46 rear sprocket instead of the 44 from last year. There arent many slow parts to the track but I think the 44 kept me from driving out of them quite as well as the 46 will allow me to. I also never ran out of revs on the track and think the 46 will get me topped out right at the end of the longest straights. Worst case is I go back to the 44. We'll see on that one.

I will dish out a full race report after the weekend with results and of course, lots of pictures.

3 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 RAFster122s

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #916 on: July 23, 2019, 12:24:56 PM »
Safe travels and safe racing!  Enjoy the time away with your wife. Good luck on the track.
David- back in the desert SW!

Offline Rocketman

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #917 on: July 24, 2019, 11:56:31 AM »
Go get ‘em Matt!  Good luck over the next two weekends.

Offline dragracer

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #918 on: July 24, 2019, 09:34:27 PM »
Good luck and much success to you this weekend. I'll be cheering you on from the Dragstrip.

Offline kmb69

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #919 on: July 25, 2019, 07:37:11 PM »
Good luck Matt. Travel and race safe.

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #920 on: July 30, 2019, 11:48:25 AM »
Thanks for the well wishes guys, it was a hell of a weekend at America's National Park of Speed.

The wife and I packed up and left for Wisconsin on Wednesday afternoon to take in some of the sights along they way, which normally includes great craft beer, enjoying the likes of 3 Floyds, Lakefront and 3 Sheeps.

We arrived at the track Thursday afternoon and got in the queue to get into our paddock. We ended up in the same spot last year, right near pit in/pit out which is great for getting a rolling bike show as the racers travel past. Unfortunately not much time to walk the pits this year, more on that later.

AHRMA has instituted a one tech per weekend process which makes the pain of waiting in line more manageable. That is unless of course you either crash or remove safety wire that holds oil behind it. Again, more on that in a minute.

With tech done Friday morning, it was simply a matter of checking tire pressures and going over the bike one more time. All good, though I still had my worries about the weird clutch issues I had been having since Barber last year.

Friday practices went well and I was able to get all 4 sessions in to get a feel for the track and was hoping to see some good lap times as I got more comfortable. I started the day with 3:05-3:08 lap times, slowed a bit as the day progressed to around 3:10. Surprised I slipped so far but there was no sense in worrying too much. Times in practice were stronger this year than last and I knew they would get better during race time. Last year I was able to put down 2:58 on the track during the race.

Saturday brought two more practice sessions of which I did the one right before lunch. I forgot my transponder so no clue on lap times but everything felt good for race 3, right after lunch.

Race time came and the bike lit right up, no issues. The race started with me on the front row next to my cousin and uncle, whom have 5 championships in the class between them. I got my usual less than stellar start but came out in 3rd place into T1, about 5 lengths behind my cousin, the current #1 plate holder for the class. Those two are wicked fast and began pulling away immediately. I settled into a nice groove, laying down low 3:02 lap times throughout the race. I never saw another guy in my class, but also didnt know if someone was stalking me or if it was a runaway 3rd place.

Last lap going downhill toward turn three and disaster strikes. I go to down shift from 4th to 3rd, let out the clutch, nothing. Shift again, nothing. Im hard on the brakes and as I am trying to find a gear I get wide in the turn, with a handful of brakes and touch grass and go down instantly. The front wheel tucks, I fly off and tumble into the grass with the bike, settling about 15 feet off the tarmac near the sand trap at T3. I feel the pain in my shoulder right away, but have the ability to get to my feet and get behind the concrete wall out of the impact zone. Just as I settle into a shady spot off track I see my uncle and cousin go by on the cool down lap. SH*T, 3 miles left of the race and my clutch craps the bed and I crash. The crash trucked picked up my ride and called medical, so I got a lift in an ambulance for the first time in my life. I was greeted by the snarkiest doctor I have had the displeasure of meeting and he quickly assessed my situation. He took vitals and noticed my heart rate was 113, and despite being a doctor at a race track, didnt seem to understand that racing and crashing tends to boost your heart rate a little. About 10 min later, my wife Ashley walks through the door and lets out a sigh of relief that I am OK. After getting a clean bill of health, I made the walk back to my pit area to assess.

Just as I arrive I see Kenny and Carnie from Cycle X hanging out. I had been talking with Kenny for the last week or so about making the trip to RA to see me race. Of course he missed my race and crash by minutes, but was there for the aftermath. We quickly got to work on figuring out what the issue was with the clutch. We noticed that the wheel turned freely in every gear, but it shifted, so not apparent transmission issues. I pulled the clutch cover to have a look and Kenny and I were greeted by the sweet smell of burned clutch. Upon disassembly, we discovered the clutch totally cooked to death. Of course my backup clutch is 400 miles away sitting in my garage, right where I don't need it. Now I need a full CB750 clutch in the next 12 hours to make the race on Sunday. A quick trip to the pits reveals a complete but unloved early '75F that looks like its better days were before I was born. I so happened to remember that Dennis (Old Scrambler) was at RA and might have what I needed. I found a buddy of his, Chris in the pits and we both called him, no answer. I spent some time talking with Chris and collected my '77F frame for my Superbike project and headed back to the pits with Ashley, Kenny and Carnie without a clutch.

Dennis had made a stop at my pits earlier and introduced himself to a few of the guys I race with and when I got back to the pits, someone says that they saw him on a CB750 getting ready to do the sunset cruise on the track. SWEET! I go to pit in and wait like a puppy dog until I see Dennis pull off the track on his green CB and I flag him down. "Dennis, need a clutch, and I hear you might be able to help." Sure enough, he confirmed he did and we set off to his storage building to find the pieces to make my racer whole again. He had everything I needed to turn the weekend around. Dennis and I parted ways and I drove the 7 miles back to RA with my wife, blasting our favorite songs along the way, feeling good about our prospects for Sunday.

Back at camp, the sun was getting low in the sky and a fellow CB750 racer, Steve Pettinger, was pitted next to us, offering me any tools and much needed light to get my task completed during the twilight hours. My wife isnt much of a wrench, but shes a damned good team mate, and offered to help where she could, for which I am forever grateful. I finished the clutch install, making sure everything was perfect each step of the way, and sealed it up and headed off to bed. Too late to start a bike now, it would have to wait until morning.

Morning came early, as they do when camping outside and the sun comes up just after 6am, and it was time to get to work. I fixed the broken brake pedal (the only physical damage to the bike besides one broken wire on my ignition idiot light) and it was time to start the bike. Im thrilled to say that it lit right up and settled to a familiar idle. I took a ride around the pits and as I was almost back to my paddock, the engine starts to sputter, I pull in the clutch as I roll forward and let it out to try and bump start the bike back to life, nothing. I walk the bike back to the pits and begin to assess. My uncle Jeff comes over to check progress and we decide to check spark first. Maybe something pulled loose in the crash. The Iridium plugs are hard to see a fat spark, especially in the sunshine, but it appeared to be there. Then it flashed  through my brain, maybe the gas was off! Of course I looked and when I thought I had turned if off after my ride, I had actually turned it on, meaning it was off for my ride. Gas on, got it. Back to the rollers. Boom, lights right up again and Im off for one more test ride, which goes flawlessly. I pull into the pits and get the bike on the stand just in time for 1st call for practice group 3, my only chance to test the bike at speed before my race. I suit up in record time, despite a pretty sore shoulder and get back to the rollers, bike lights right up again. It seems to be shifting better than it has since Barber last year, things are looking good.

I get out on the track for practice and put in some fairly aggressive laps, still remembering my spill yesterday, but not concentrating on the past, only the future. Back to the pits after a few times around, and go time was only a couple hours away.

Lunch passed quickly and I was ready for race 3. I was again on the front row, with Jeff and Nick (uncle and cousin) to my left, all ready for a drag race down the front straight. Again, my usually slow start though better today than Saturday, complete with wheelie, leaves me behind Jeff and Nick, drag racing with a couple other guys in the class as we run full song into T1. I had a chance to dice it up with another fast XS-based bike for the first lap, getting passed and passing a couple times, before being passed for good, settling into a 4th place spot. My plan was to run my race and deliver the best finish I could and go from there. A couple laps later I see the 3rd place rider pull off onto pit lane, and my first though was I somehow missed the checkers and since the track is so big just never saw anyone else out there on cool down. Well if you run the checkers you get fined $25, but for that I was willing to pay since I had not seen checkers yet. Sure enough I was still racing. Every corner I checked to see a flag pointed at me or waving or something to indicated I screwed up, it never came. The next lap I finally saw the checkers just as I was passed by the leader from wave 1 climbing the hill toward the start/finish. I was thrilled to have finished 3rd, back on the podium and redemption from Saturday's crash. I cooled down and made my way back to the pits, where I was greeted by my wife who told me I had gotten 2nd place! My cousin Nick had dropped out due to a warped brake rotor, leaving me with 2nd and Steve Pettinger with 3rd. That makes 3 podium finishes on the weekend for CB750s!

The time after the race included breaking down camp and getting ready for the 5 hour ride home back to Michigan. We said our goodbyes, though only for a short few days, as racing picks up in my back yard in South Haven, MI at Gingerman Raceway this Friday.

I will do my standard maintenance items like oil change and faster check, but I will be running the stock clutch that saved my butt again this weekend. Here's to a couple days off to prep and rest before getting into another great weekend of road racing.

A massive thank you to my wife Ashley, who is definitely by biggest fan, to Dennis for the clutch and the sage advice on NOT mixing parts, and to Steve Pettinger, our camp mate and CB750 nut that helped me get through the weekend.

Your boy, running about 25lbs lighter than my last race:


Good drinks with great company on the way to RA:


Hero pose, ready for battle:


Getting serious:


Come on knee, just a little lower!:


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 - RA Update
« Reply #921 on: July 30, 2019, 02:27:14 PM »
Congrats on the podium finishes and overcoming the  clutch problem. Glad Dennis was able to help you get going again with parts.

It is good you had fun with your wife on the trip.

Best of luck at Gingerman!  Safe travels and time on and off track.

David
David- back in the desert SW!

Offline Tintop

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Re: CB750 AHRMA Sportsman 750 Racer - RA Update
« Reply #922 on: July 30, 2019, 02:33:36 PM »
Congrats on the podiums, and thanks for a great race report.  Rubber down for Gingerman.
1977 CB550/4 Cafe - Speed Warrior / BOTM 03/11
1980 CB750F (project)
Whittaker GBF Vintage Racing Sidecar (XS750 power) - ITG / 151's / CMR Racing Products (SOLD)
1976 CB400 SS - stock / BOTM 04/11 (SOLD)
1973 CB750 K - basket case (SOLD)
77 CB550 Cafe build
550/750 Filter Thread
Sidecar Rebuild Thread

Offline seanbarney41

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Re: CB750 AHRMA Sportsman 750 Racer - RA Update
« Reply #923 on: July 30, 2019, 06:34:48 PM »
You will have at least one more fan at gingerman...see you then Matt
If it works good, it looks good...

Offline bear

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Re: CB750 AHRMA Sportsman 750 Racer - RA Update
« Reply #924 on: July 30, 2019, 07:12:31 PM »
Well done Matt.

In my opinion you definetly have the right attitude with your racing.
The results will only get better with time and experience I'm sure.

I'm pleased you could swap notes with Dennis, from what I've read he has a good understanding of what's required to compete on these  bikes successfully.

I offer one bit of advice.
No doubt you will be carrying a spare clutch in your spares kit from now on.
Can I suggest you  assemble a complete spare refurbhished clutch ie new springs, steels, fibers, clean up the basket and check it runs true along with the top plate.
Run the unit in for a few practise laps disassemble it and store the parts together with the steels and fibers in a sealed plastic bag in oil.

I have destroyed a green clutch in seconds. You will also find a "seasoned clutch" will not require any where as much adjustment.

We always treated the cluch as a consumable. It got removed disassembled and checked during every oil change.

Only a suggestion tread your own path and enjoy you racing.

Cheers,
Brian



« Last Edit: August 14, 2019, 12:40:20 AM by bear »
The older I get the faster I was.