Author Topic: CB750 AHRMA Sportsman 750 Racer  (Read 175247 times)

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Offline simon#42

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Re: CB750 AHRMA Sportsman 750 Racer - Topeka/Jersey
« Reply #1125 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 #1126 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 #1127 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 #1128 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 #1129 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 #1130 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 #1131 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 #1132 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 #1133 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 #1134 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 #1135 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 #1136 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!

Offline dragracer

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1137 on: October 14, 2021, 08:31:45 PM »
Congratulations.  All the hard work paid off. Looking forward to seeing another championship from you next season.

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1138 on: October 15, 2021, 06:52:36 AM »
Congratulations Matt. Your persistence paid off.
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline bwaller

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1139 on: October 15, 2021, 07:05:32 AM »
Atta boy Matt! Gotta love it when a plan comes together!

Offline Old Scrambler

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1140 on: October 15, 2021, 08:23:13 AM »
Great Job ;)

You have made yourself look small on the bike :)  Good writing and GREAT family support :)
Dennis in Wisconsin
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Offline Ramrod_Racing

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1141 on: October 15, 2021, 08:40:03 AM »
Great racing with you in Formula Vintage this year. See you in Heavyweight Superbike next year ;)

Offline Rocketman

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1142 on: October 15, 2021, 05:03:11 PM »
Congratulations on your championship!  A well deserved reward for your riding skills, bike preparation, and commitment. Best of luck in 2022.

Offline gschuld

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1143 on: October 15, 2021, 06:13:12 PM »
Congratulations Matt.

I’ve seen up close and personal how much effort Matt has put into reaching the top of Sportsman 750.  His main competition was his own fresh and blood, Jeff Hargis(uncle).  Jeff has been racing for over 20 years.  He is lightweight, and spend many years honing his skills.  He is a true racer.  Jeff is not only lighter as a rider, but his highly modified big bore Yamaha sx650 is a good bit lighter than any Cb750 can ever hope to be.  This gives him a big advantage in the corners.

Matt had to improve both his bike, and his skills, to stay with him. Every year he got better.  Getting closer all the time.  He improved his bike enough to be able to win against Jeff before he was ready himself.  As Matt’s skills and confidence grew, he was able to have some great battles with Jeff.  Often they would split 1st and 2nd places between Saturday and Sunday at an event.

Matt earned it this year.  He build a great handling, powerful, and dead RELIABLE bike.  And he learned how to push it hard enough to win.

His wife Ashley is more supportive than any racer could ask for.  And young Jackson is a one man band of entertainment at the track.

There are several sohc 750 road race bikes that have been, and continue to be, inspired by Matt’s performance and willingness to share his knowledge and help with others.

Nice racing Matt.

George


Offline hondaron

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1144 on: October 15, 2021, 06:38:03 PM »
Congrats on a well deserved Championship

Janet and I were at Barber last weekend, but got lost in everything Barber has to offer, sorry we didn't make it by to say hello 😀

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1145 on: August 03, 2022, 11:31:26 AM »
Lot's going on this season, though not much in the way of pictures this time. I have been to several rounds of racing this year, including my first trip to Daytona. That is an amazing track! There is nothing in the world like riding at top speed around those high banks, feeling like you are being flushed down a giant toilet at warp speed. I would definitely like to go back and really push my bike. I picked up a couple of wins at Daytona, starting the season off right.

My next stop was Carolina Motorsports Park in South Carolina, one of my favorite tracks to race. Technical with some elevation changes, and more of a fast sweeping track the first half and very tight the last portion. I finished 2nd to my uncle on his XS650 both days.

The next round in Kansas found me with my first crash in quite some time. I had not had a race crash since Road American in 2019 so this one left me a bit rattled. I was leading Saturday's race, half way through and went for a downshift into a left/right/right/left chicane on the back straight and the rear wheel locked momentarily, keeping me from tipping into the turn. The result was an a trip into the grass, which also happened to be flooded with around 4-6" of water from earlier inclement weather. As soon as I hit the water I went down. I wasn't moving too quickly so the crash was relatively soft but did manage to get my right ankle stuck under the bike so was unable to move until they cleared the track and the track crew came to help lift the bike. I was able to get back to the pits and compose myself to get back on track with the Superbike, but clearly not in fighting shape mentally.

The damage was zero thankfully, just about 15 pounds of mud and grass that needed picked out of the right side near the exhaust/ignition cover. I drained the oil and dropped the pan to see if there was anything transmission related that may have caused the wheel to lock and found nothing. I had to "borrow" some oil from another racer to get going again and took a successful test ride. All was well and I was able to finish 3rd on Sunday, my worst finish in the last 2 years.

The following round in New Jersey met with some friendly faces, with Mike Rieck, Brent Waller and George Schuld attending the weekend's races. I still had a bit of reservation about pushing the bike after the last outing, but did manage a couple more 2nd place finishes. We stay close to Michigan the next 2 rounds with Blackhawk Farms in Illinois and my home track, Gingerman. After that it's onto the big show at Barber!

Thinking ahead to next season already, it has been announced that Formula 750 will be the featured class for the Vintage Cup. My bike is already very similar in many ways to the Formula bikes, so I have decided to make the jump and perform a few key upgrades to get the bike right and tight for next year.

I have sourced a new set of GL1000 fork lowers to set up a dual disk front end, with AP calipers and a set of thinned and drilled rotors from Godffery, with the carriers modified to fit my quick-change hub. Stopping power will never be a question again!

I will also be adding a half fairing to keep with the F750 look and rules. I chose the Rickman Competition half fairing from Air Tech to that end, but it will need a custom bracket made, as well as relocating the oil cooler to get it out in the wind more, so a bit of plumbing will be needed for all of it to work.

The engine is the big piece that will help me keep pace with the F750 front runners. I have been limited by stock round top carbs in my current class, but with F750, CR31 can be used. Coupling that with a stronger cam and careful JMR rework of the head I blew up in 2019 will make for a very potent package. I was sitting around 80hp and should be able to break 90 with these new modifications.

I am expecting some pretty heavy hitters out there next year in F750, many of which I have shared the track with, but seldom race head to head. It should make for an amazing season next year, but for now, I need to focus on pushing the bike hard this season to lock up my 2nd place spot in the S750 championship.
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 Rocketman

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1146 on: August 03, 2022, 01:48:13 PM »
Formula 750 is one of my bump classes!  With the upgrades you are planning your  750 should be very competitive. Look forward to chasing you around next year. Best of luck the rest of the season!

Offline Old Scrambler

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1147 on: August 03, 2022, 02:46:42 PM »
Go for it 8)
Dennis in Wisconsin
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CB750 Classic Bonneville Racer thread - http://forums.sohc4.net/index.php/topic,135473.0.html
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Offline kmb69

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1148 on: August 04, 2022, 03:35:10 AM »
..... I was leading Saturday's race, half way through and went for a downshift into a left/right/right/left chicane on the back straight and the rear wheel locked momentarily, keeping me from tipping into the turn. .....

Need a slipper clutch!  ;)

I have a slipper designed and modeled, semi copied from the DOHC world, but I have not made one yet.
It should stop that rear wheel skipping on downshifts and stop any slippage if it works as intended.
Has 2-way cam action so it slips on downshifts and locks up on power like modern bikes.

What clutch version are you running?

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1149 on: August 04, 2022, 05:27:15 AM »
..... I was leading Saturday's race, half way through and went for a downshift into a left/right/right/left chicane on the back straight and the rear wheel locked momentarily, keeping me from tipping into the turn. .....

Need a slipper clutch!  ;)

I have a slipper designed and modeled, semi copied from the DOHC world, but I have not made one yet.
It should stop that rear wheel skipping on downshifts and stop any slippage if it works as intended.
Has 2-way cam action so it slips on downshifts and locks up on power like modern bikes.

What clutch version are you running?

A slipper would be frickin' awesome! I'm running an EBC clutch and coated steels from Kenny. Great service from them so far.
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