Author Topic: CB750 AHRMA Sportsman 750 Racer  (Read 171111 times)

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Offline dragracer

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1175 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.

Online Jerry Rxman Griffin aka MuthaF'er

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1176 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 #1177 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 #1178 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
'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 Ramrod_Racing

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Re: CB750 AHRMA Sportsman 750 Racer - 2021 Post-season Report
« Reply #1179 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 #1180 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 #1181 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 #1182 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 #1183 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 #1184 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 #1185 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 #1186 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 #1187 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

Offline kmb69

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1188 on: August 04, 2022, 08:29:38 AM »
.....
A slipper would be frickin' awesome! I'm running an EBC clutch and coated steels from Kenny. Great service from them so far.

I was asking about what year model clutch are you using? They have different stack heights, early vs late.

Also, I'm guessing you are not using that double-wide steel plate, correct?

I'm told the slippers being used in the DOHC's are good for several seconds faster lap times.  8)

Another benefit is spring pressures are not so critical - only need enough for the initial launch mainly.
Lighter clutch lever pressure and the harder the motor pulls, the tighter the clutch holds.

Offline slikwilli420

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1189 on: August 04, 2022, 09:03:14 AM »
.....
A slipper would be frickin' awesome! I'm running an EBC clutch and coated steels from Kenny. Great service from them so far.

I was asking about what year model clutch are you using? They have different stack heights, early vs late.

Also, I'm guessing you are not using that double-wide steel plate, correct?

I'm told the slippers being used in the DOHC's are good for several seconds faster lap times.  8)

Another benefit is spring pressures are not so critical - only need enough for the initial launch mainly.
Lighter clutch lever pressure and the harder the motor pulls, the tighter the clutch holds.

Sorry I didn't understand. I'm using late clutches on both bikes with the double steel plate in the middle and the wider tab friction at the front. Kenny felt that setup was the best route. I'm very happy 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

Offline MRieck

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1190 on: August 04, 2022, 04:40:49 PM »
Slipper would be nice especially when you start increasing compression. They inspire confidence.
Owner of the "Million Dollar CB"

Offline stephenpettinger

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1191 on: March 22, 2023, 05:27:31 PM »
Hi all,
Anyone ever make a slipper clutch work on a single cam bike?

Offline Ramrod_Racing

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1192 on: March 23, 2023, 10:01:45 AM »
Hi all,
Anyone ever make a slipper clutch work on a single cam bike?

Oooh, I like where this is going!

Offline bear

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Re: CB750 AHRMA Sportsman 750 Racer
« Reply #1193 on: March 25, 2023, 01:45:38 AM »
Hi all,
Anyone ever make a slipper clutch work on a single cam bike?

Hi all,
Anyone ever make a slipper clutch work on a single cam bike?

Oooh, I like where this is going!

I ran a locker for the last two seasons racing my SOHC sidecar.
The four post clutch took a bit of tuning.
As usual I broke a couple of clutches before we got it right, but once sorted it made a big difference to the bike.
The older I get the faster I was.