Author Topic: Clymers High Performance modifications  (Read 2734 times)

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Offline PeWe

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Re: Clymers High Performance modifications
« Reply #25 on: December 06, 2021, 07:58:29 AM »
Fun info.
This together with Action Fours and Russ Collins catalogs nice reading before Christmas whenever it was supposed to happen. Just order when you want it to happen;D

I'm really pleased that the go fast parts got a comeback 35 years after bike stopped to be made thanks to CycleX, Dynoman, APE, Webcam, Megacycle, Mike Rieck and others.
Parts better than ever.

I synched my carbs today and got it to idle really nice. Like a nice stocker with a little bit harder sound, absolutely not as 125-75 cam numbers can be thought to act.
I need to find one more. It would be horrible if not having a spare before production is stopped.
I can get you a 125-70 cam anytime you want Per.....they are all hardwelded now so all you need is a donor cam and i have a number of them on hand.
Thanks Mike!
I have had thoughts about that the last weeks. I have asked a friend if he has in his hidden boxes. Probably not.
Next is asking you. The setup now need a Dyno run. Then in with the welded one and check again. ;D
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 Don R

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Re: Clymers High Performance modifications
« Reply #26 on: December 06, 2021, 09:11:14 AM »
 An excellent read, my question is the reference to the F and A light flywheels. I assume they are referring to the standard non heavy flywheel used after the K0's?  If F and A had a lighter one, I need to take a scale out to the shop to find them. L0L.
No matter how many times you paint over a shadow, it's still there.
 CEO at the no kill motorcycle shop.
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Offline Jerry Rxman Griffin aka MuthaF'er

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Re: Clymers High Performance modifications
« Reply #27 on: December 06, 2021, 10:30:17 AM »
Don, from what I've seen there are 3 stock rotors. The boat anchor, the "standard" one and the later lighter one. By all means weight what you have. 
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline scottly

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Re: Clymers High Performance modifications
« Reply #28 on: December 06, 2021, 10:13:24 PM »
Jerry, I think there are only two different rotors: the early type with the flange, and the later type without the flange. My K1 with the flange weighed about 5.8 pounds, and the K7 rotor without the flange that I'm using now weighs about 4.6 pounds. Almost 1/2 pound more can be removed from the late rotor without losing any charging capabilities, but the RC claims of removing 3 or 4 pounds off even the heavier 5.8 pound rotor and still having any charging at all are way off. ;)
Your pic from the last time this came up shows an early rotor on the left, and two modified rotors on the right; neither is the stock late rotor. As far as when did they start, does your F0 have the early rotor or the late style?
Don't fix it if it ain't broke!
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Offline PeWe

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Re: Clymers High Performance modifications
« Reply #29 on: December 07, 2021, 12:55:15 AM »
Alternators
K6 lightened early 80's, still used and working fine. No charging issues.
Stock later alternator.
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 Jerry Rxman Griffin aka MuthaF'er

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Re: Clymers High Performance modifications
« Reply #30 on: December 07, 2021, 10:13:09 AM »
I'm with you on this Scottly. My F has/had the later rotor.

I'm sitting on a lightened RC rotor that has half the threads stripped. The outter threads. What a #$%* to remove. It resides in my stash now. Suggestions to reuse?
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline MRieck

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Re: Clymers High Performance modifications
« Reply #31 on: December 07, 2021, 11:13:08 AM »
I'm with you on this Scottly. My F has/had the later rotor.

I'm sitting on a lightened RC rotor that has half the threads stripped. The outter threads. What a #$%* to remove. It resides in my stash now. Suggestions to reuse?
A paperweight Jerry. ;D ;)
Owner of the "Million Dollar CB"