Author Topic: CB750 AHRMA Sportsman 750 Racer  (Read 175259 times)

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Offline Old Scrambler

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Re: CB750 AHRMA Sportsman 750 Racer - Roebling report
« Reply #1050 on: February 26, 2020, 03:37:31 PM »
Great race report :) :)

Sounds as if you have a handle on the oil leaks. I use a very light amount of Honda-Bond on the case-halves.

Good Luck on the season........ ;)
Dennis in Wisconsin
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Offline Rocketman

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Re: CB750 AHRMA Sportsman 750 Racer - Roebling report
« Reply #1051 on: February 26, 2020, 07:13:45 PM »
That's the way to start the season Matt!  Looking forward to checking out all the improvements to your bike at the races later this year.  Current plan is to start my season at Topeka.  Is it on your schedule?

Offline MessnerMoto

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Re: CB750 AHRMA Sportsman 750 Racer - Roebling report
« Reply #1052 on: February 26, 2020, 11:45:13 PM »
shame for cam tensioner... some guys are entering second season with the same tensioner now...

primary works of corse without tensioner restrictor/adjuster, but some people were pointing out on this forum that this adjuster is most beneficial to racers... not to go in discussion.

...my only concern for primary tensioner is oiling of upper guide.... there should be a lot of oil coming out of primary drive sprocket and oiling the chain and guide.... like anything else in engine without lubrication it will fail

..... you can not imagine when you put also my cam tensioner how silent engine becomes. Than other sounds start to be annoying like clapping of flat shiber carbs....
« Last Edit: February 26, 2020, 11:50:47 PM by MessnerMoto »

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Roebling report
« Reply #1053 on: February 27, 2020, 12:19:12 PM »
Great race report :) :)

Sounds as if you have a handle on the oil leaks. I use a very light amount of Honda-Bond on the case-halves.

Good Luck on the season........ ;)

I would have never figured that it would be OK to put hondabond there but now I know for next time. The real trick sh*t would be to have an oring boss in there so when you bolted the halves together, there was nothing to squish around and the studs would become oil tight. Another opportunity for improvement I guess.

That's the way to start the season Matt!  Looking forward to checking out all the improvements to your bike at the races later this year.  Current plan is to start my season at Topeka.  Is it on your schedule?

Topeka is definitely on my schedule Martin. Glad its on yours too. Its shaping up to be one of the biggest events all year, aside from Barber.

shame for cam tensioner... some guys are entering second season with the same tensioner now...

primary works of corse without tensioner restrictor/adjuster, but some people were pointing out on this forum that this adjuster is most beneficial to racers... not to go in discussion.

...my only concern for primary tensioner is oiling of upper guide.... there should be a lot of oil coming out of primary drive sprocket and oiling the chain and guide.... like anything else in engine without lubrication it will fail

..... you can not imagine when you put also my cam tensioner how silent engine becomes. Than other sounds start to be annoying like clapping of flat shiber carbs....

I think I have a few mental hangups about it as well. All of the turns the chain is taking as it runs around in the engine is one. Honestly, the mention of one or two seasons being good longevity is another. Something like that should have a much longer lifespan, even in a race motor. Bathed in oil, there really is nothing to wear out. Please don't take any of this as criticism of the design or part, just things that I would like to see more proven out in other people's engines. I don't have the budget to keep getting into my engine all the time. The bike isnt that high strung, so I dont expect to be in the bottom end again for a couple of years, assuming I don't break anything.

I do plan to install the limiter for the primary tensioner though, just didnt have time as everything came together for this season.
All you gotta do is do what you gotta do.

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Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1054 on: August 13, 2020, 12:56:21 PM »
FINALLY! Back to racing. This was the big double-header weekend here in the Midwest where I get to visit my home track and new for this year, Blackhawk Farms Raceway in South Beloit, IL. I last raced in February at Roebling Road in Georgia, so this has been a long time coming for me and so many others itching to get back to it.

Blackhawk is about 4 hours away making it an easy half day drive to get set up. I was fortunate to be able to do a track day on Thursday, leading into a full weekend of racing. I had never been at the track before and it was new for AHRMA so most of the organization had never turned a lap there. I figured I would get the leg up on the competition and lay down some laps for the track day, make sure all was well, and steadily pick up the pace and learn the track. I got some great pointers from one of the track day instructors, which had me change a few shift points on the track and think about corner setup differently, and it paid off during Friday practice. I typically get faster throughout my practice sessions and settle into a time that is usually still a few seconds slower than race pace. I was running into the 1:29’s during practice Saturday, ending up in the low 1:26’s for racing on Saturday and low 1:27’s on Sunday. I was thrilled to finish 3rd behind two class champs that have won the title a combined 10 times between them. I ran a strong second for about half the race but was passed and couldn’t make it stick. On Sunday I was never even able to show a wheel and finished behind 2nd by about 0.6 seconds. Overall the bike ran well, with no issues or hiccups that couldn’t be easily addressed and only one small off track excursion during practice to avoid being hit by another rider, but I kept her up so no foul there.

The best-case scenario played out between weekends, where I did not have a single thing to do to the bike, and it just sat, waiting to get back on track. South Haven is just an hour from my house, so another easy drive to and from, making is much less of a “thing” than driving 12 hours across the country. Gingerman is a track that I have known longer then I have been racing, having watched my uncle race here and holds the distinction of the only track I have been to where I have never gotten on the podium, or “got wood” as we say. I missed wood last year by 0.026 seconds on Sunday and after getting the rust off the weekend prior, I was as ready as I could be.

Friday practice was smooth and fast and felt very natural after so many sessions on track the week before. I had swapped to fresh set of race tires from the weekend before, so my confidence and resolve to get on the podium was high. The races both days were some of the best and closest I have ever had. I lined up on the front row with both my uncle (won both races the weekend before) and Mike (finished 2nd ahead of me both races the weekend before) and one other racer for a drag race to turn 1. No one beat my uncle Jeff to turn one but even after my usual slow start, the might of the Honda Four came on strong and I tailed him into turn 1. You could have thrown a blanket over us damn near the whole race. We traded the lead at least 3 or 4 times throughout our 8 lap battle and later found out we left the rest of the field quite far behind. He certainly brought out the best in me. I always joked, Do What Jeff Does (DWJD) and this time, for whatever reason, I was able to follow my own mantra. I did everything he did, trying to be a little bit faster on the throttle and a little lighter or later on the brakes at every turn. His twin can’t be dialed on while leaned over like mine can so I was able to make up my extra weight and relatively lower torque by throttling on sooner coming out of each corner. Then it happened, white flag, don’t f*ck up. Thankfully I ran the lap of my life at the track and finally bested my uncle. I had been the reigning class champion, the guy who usually leaves everyone in the dust. I had not only won my class, but I had won the race overall, taking the checkers for the entire field of bikes. Podium? Check. Win? Check. Beat my uncle in a fair and square race? Check. Win against him at our home track? Double check. So many milestones had been reached all at once and it was such a great feeling to finally prove that I as a rider, and the Honda Four as my mount, were worthy and deserving to be in this class, and that it wasn’t some inside joke I wasn’t part of. Vindication for Honda in a class dominated by Triumphs and Yamahas.

It rained most of the night Saturday and we woke to a very wet track and paddock area. Rider skittishly took to the track for morning practice, but I was having none of that. I was on a purportedly decent rain tire (Conti 3CR) but I figured I would just psyche myself out if I went out and putted around. There were a few crashes in practice and most coming back stated there was nothing to learn going half speed.

We were race 3 again so we were set to hit the track before lunch if races 1 and 2 went off relatively as planned. The track was wet by the time we went out, but with no standing water and conditions improving quickly.

The grid lined up the same as Saturday, set for a drag race into turn 1. It was a near facsimile of the day before, my slow start but then the power of the four came around and I got through T1 right behind my uncle. I settled into a groove of DWJD for the race, trying not to push too hard as I am unfamiliar with riding in the rain and worry about tires being up to temp. I continue to do what he does, trying to stuff my wheel inside of him as often as I can. I had learned a valuable lesson the day before on the one place he was slower than me on the whole track. I followed him for 7.5 laps waiting to come to that turn and make the pass, and I did! I passed to the inside of a left hand turn and as it transitioned to a right hand sweeper, I drifted ever so slightly wide from the inside rumble strip and opened the door for him. He passed me back inside that turn and we drag raced down the back straight to the last corner, a 90 degree right hander. Its so close to the finish after that turn that whoever gets to T11 first, usually wins the race. I tucked in and drafted like my life depended on it but didn’t have enough to close the deal, and he bested me at the line by 0.888 seconds. Splitting the weekend’s wins with my uncle Jeff and having a battle that good is one of my new favorite stories of racing.

The end of a great weekend has me feeling proud and accomplished, but also looking forward. Assuming COVID doesn’t crap on more stuff this year, CMP in Kershaw, SC is 3 weeks away and Barber is less than 2 months away. CMP is freshly paved as of about 3 weeks ago and Barber is still likely quite fresh from a repave last year. I am looking forward to more racing, smooth tracks and lots of fast laps.

Sights from the double header weekend:














https://photos.google.com/share/AF1QipOqsF64hg_98O4oCidvU6R9WCeHnl85UfJjWxW6--dzVsrjV1Tq0Bs-7sYBivWFtw/photo/AF1QipOKkIHZHeD42-urDRw3Ub4FBstrb-ckNnWYRbcE?key=anRYNllNaHZiSWJRczRtSEhLM3dGMGlvOG1MVGF3

https://photos.google.com/share/AF1QipP_SclWF7l5BfOreLr4EyOAqtaWxp6CZILi6xX9dYsVQOKwaZNfJ7IeQrnoi81FOg/photo/AF1QipM5T1T9LcxhQRMEQwRxSX3E_2o5XfUBcc0tLUxY?key=SmwtVVpwOS1PaDZzWDZhek03N2tRTXJ0TV9CY0lB

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 napoleonb

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1055 on: August 13, 2020, 03:38:29 PM »
Congrats on the results!

Offline seanbarney41

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1056 on: August 13, 2020, 04:38:45 PM »
Hell yeah Matt!  You are a serious threat now!

I chose not to attend the Gingerman race...figured you guys deserved to just not have to worry about one more spectator germin' up the track.  But sounds like I missed out on some good racing.
If it works good, it looks good...

Offline MRieck

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1057 on: August 13, 2020, 05:42:50 PM »
 Congrats Matt.....well done. I have a new batch of stickers that Brent got me.....I'll send some out.
Mike
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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1058 on: August 13, 2020, 10:02:53 PM »
Nice reading! :)
Bike runs better this year or is it you only?
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Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1059 on: August 14, 2020, 07:21:24 AM »
Hell yeah Matt!  You are a serious threat now!

I chose not to attend the Gingerman race...figured you guys deserved to just not have to worry about one more spectator germin' up the track.  But sounds like I missed out on some good racing.

Thanks Sean! It was pretty slim on spectators but more were there than Blackhawk which specifically said riders and crew only. The racing was solid both weekends. Look forward to having you back out next year.

Congrats Matt.....well done. I have a new batch of stickers that Brent got me.....I'll send some out.
Mike

Thanks Mike! The head did its job and the engine performed flawlessly both weekends. The howl at 9k+ is just insane.

Nice reading! :)
Bike runs better this year or is it you only?

I think its mostly me this time around. The bike is pretty much as it was before the big blowup at Barber. I am not much lighter weight wise than I was toward the end of last year, so clearly the confidence is rising. I am back to pushing myself weight and training wise though. I am now at my lightest weight in my adult life and running 5+ miles per day. I really need to get back to weight lifting as well, but all that leg work has kept me from having any fatigue issues with my lower body over the course of a race. I used to come off track and start to get sore almost right away. I did 13 sessions on track at Blackhawk over 4 days and was only slightly sore on the drive home on Sunday. The formula is working.
All you gotta do is do what you gotta do.

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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 Old Scrambler

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1060 on: August 14, 2020, 08:33:21 AM »
You bring a smile to my face.......and mind ;D  Yes, as we age the legs are the first to go ;)
Dennis in Wisconsin
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Offline Rocketman

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1061 on: August 14, 2020, 10:14:08 AM »
Congrats on the win!  Getting it by besting tough competition is the best! 

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1062 on: August 14, 2020, 12:01:21 PM »
Fantastic news Matt. Congratulations. I hope to see you race in person again.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline Old Scrambler

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1063 on: August 22, 2020, 08:08:01 AM »
Apparently the Barber Vintage Motorcycle crowd-event has been cancelled.....BUT....the AHRMA races will be held :) :) :)
Dennis in Wisconsin
'64 Triumph Cub & '74 Honda CB750 Bonneville Salt Flats AMA Record Holder (6)
CB750 Classic Bonneville Racer thread - http://forums.sohc4.net/index.php/topic,135473.0.html
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Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1064 on: August 24, 2020, 07:16:01 AM »
Apparently the Barber Vintage Motorcycle crowd-event has been cancelled.....BUT....the AHRMA races will be held :) :) :)

Yes, that's correct. Going to be a really weird event. Im so used to 80K+ people wandering the grounds. It will be very strange to have the whole place to ourselves. Id still expect top-notch racing, too bad no one will be there to enjoy the sights and sounds aside from riders and crew.
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 - Double Header report
« Reply #1065 on: August 24, 2020, 08:31:24 AM »
No TV channels that cover it?
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 Ramrod_Racing

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1066 on: August 24, 2020, 09:29:29 AM »

Yes, that's correct. Going to be a really weird event. Im so used to 80K+ people wandering the grounds. It will be very strange to have the whole place to ourselves. Id still expect top-notch racing, too bad no one will be there to enjoy the sights and sounds aside from riders and crew.

It'll pretty much look like the WERA race I went to there a few weeks ago.

Offline chrissprior

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1067 on: September 29, 2020, 12:28:49 PM »
Great work on the oiltank! Lovely to see the detailing. And no do not redo anything for that matter. Follow your own path in this. But mind you there are more roads leading to Rome. Even with the oem oiltank there is no problem with air. The system works, but the reason behind the use of the dry sump is not clear. They, Honda, did not stop making models with it for no reason. And very few had any problems. But..........there are also people who wonder how it would look or work without the tank and lines . Some for looks, some for other reasons. Like me, I ran my 750's all with dry sump, tanks, lines, coolers and what not. Always looking for ways to improve the bike for use on track, with use of time specific parts. No USD forks, no Ohlin shocks, no wide tyres, just like in them ol'days. Build, or altered all my parts by myself and some parts, SMAC wheels, tank are all in my possession from new in '75. Long story, but my main reason for going to run and test the "Sumpthing" is that there is a lot of theoratical discussion without any practical backup. If I wonder about an issue I tend to do something about it, if interesting. And I think this is.
I have made an agreement with BJ, who has this produced and we are both interested to see how it copes with a bike build for the track, though designed for mainly caferacers who dislike the oiltank feature on the bike.

Will keep you updated.

Rob

Hi Rob, sorry just looking into the sumpthing !   Did you do your testing and what results did you have

Chris

Offline dragracer

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Re: CB750 AHRMA Sportsman 750 Racer - Double Header report
« Reply #1068 on: September 29, 2020, 03:17:35 PM »
Thanks for the detailed report.  Congratulations on the win and strong finish.  I will check my schedule for Kershaw and try to come up.  I'm about an hour away from the track.

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1069 on: February 25, 2021, 12:01:21 PM »
Well, Im still here and right now the bike is in bits with about 3 weeks until I kick off my 2021 race season. I never did make it to the big show at Barber in October, thanks to Hurricane Delta. The guys I talked to got drenched, and to me thats no fun, nor am I a huge fan of riding in the driving rain. Needless to say, the itch to go racing is pretty bad right now.

I had another crushing blow in the form of a destroyed cam chain tensioner (stock Honda this time, not the Cappellini from last time, try to keep up ;)). I had the head checked over by JMR and got a clean bill of health on springs and guides so its ready for another season, minus a few time serts that need to be installed.

I pulled the cases apart to take a look at my MessnerMoto primary tensioner to see how it was holding up and it looked great, with no discernable wear on the top slider or the bottom tensioner. I did notice some interesting wear on the crank bearings on the alternator side, worn down to the copper. So new green bearings were ordered and coated with Calico CT-1 dry film for some reportedly excellent wear resistance and additional lubricity. I also had the cased line lapped and checked by Kenny at Cycle X just to be sure that part of the equation was all good to go. He gave the cases a clean bill of health and they are headed back now.

The rest of the bike just needed some good old fashioned cleaning and elbow grease to get up to snuff. My front brake rotor performed flawlessly last year, giving as much confidence as the cast iron before it, so that system will simply get a fresh fluid change and be good.

I have also taken to building a swingarm similar to the CMR units, but with my own take on things. Unfortunately, with Denis passing I wasn't able to get in the queue to have mine built. It has been a pretty simple process, though taking a lot of time. The whole unit is 1x2 4130 chromoly with tapered roller bearings for the pivot. All the final welding and fittings (shock mounts, brake torque arm stay, paddock stand bungs and chain slider) are set to be welded up early next week.

The only other major component that needed some love was the bodywork. I finally had a proper seat cover made up (thanks Mom!) and had the bike all painted. Now the seat, tank and front fender are covered in Subaru World Rally Blue, with the appropriate stickers added of course.

A few pictures for your enjoyment!













22 days...
« Last Edit: February 25, 2021, 12:16:30 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 Ramrod_Racing

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1070 on: February 25, 2021, 12:24:44 PM »
Very nice!

See you at CMP

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1071 on: February 25, 2021, 12:26:21 PM »
Very nice!

See you at CMP

Yessir Mr. #1 plate. You racing F Vintage?
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 Ramrod_Racing

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1072 on: February 25, 2021, 01:09:50 PM »
Very nice!

See you at CMP

Yessir Mr. #1 plate. You racing F Vintage?

Yes. Though it would be a more fun bump up class than VSBHW because of the grid size and diversity. I may have to reconsider come next year.

Offline bwaller

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1073 on: February 25, 2021, 04:21:25 PM »
Matt have you ever sent a used oil sample to Blackstone? They make a determination of bearing wear (protection) by suspended metals and viscosity loss among other things.

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB750 AHRMA Sportsman 750 Racer - Time for 2021
« Reply #1074 on: February 25, 2021, 05:20:40 PM »
And do you have an assumption on that bearing wear? Clearance? Oil flow? Etc? I'm curious what the clearance was after the wear. What's the crank journal look like?
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)