Author Topic: Cb750 rocker arms and shafts  (Read 1757 times)

0 Members and 1 Guest are viewing this topic.

Offline Fire1100

  • Full Member
  • *
  • Posts: 1
Cb750 rocker arms and shafts
« on: April 21, 2017, 10:33:12 AM »
Hello all I've been reading the forum for years and finally am building my bike. I am having an issue with the rockers and shafts. My rockers measure between 12.05 and 12.07 and the shafts between 11.96 and 11.95. I know this is too far out of spec for what I'm doing and need advice on where to get new rockers and shafts. I have access to a machine shop and I'm not opposed to making my own shafts out of Thomson shafts but the rockers are where I'm lost. The engine is high horsepower and will see high revs more than a street bike. Any help is greatly appreciated.

Offline Jerry Rxman Griffin aka MuthaF'er

  • This MuthaF'er is getting to be a
  • Really Old Timer ...
  • *******
  • Posts: 14,902
  • Bought her new 4/75
Re: Cb750 rocker arms and shafts
« Reply #1 on: April 21, 2017, 12:43:48 PM »
There is a single NOS shaft on EBay. Grab that and at least use it for measurement comparison. Relatively rare but not as rare as new rockers  :o
As of today 3/13/2012 my original owner 75 CB750F has made it through 3 wives, er EX-wives. Free at last.  ;-)

Offline cbr954

  • Hot Shot
  • ***
  • Posts: 402
Re: Cb750 rocker arms and shafts
« Reply #2 on: April 21, 2017, 06:01:04 PM »
You can get rebuild hardwelded rockers from Cyclex and Dynoman.  Other wise they are discontinued from Honda.
03 CBR954RR, 72 750 chopper(970cc
F2 head), 2017 CRF450R, 2001 CR250R, 72 CB500, 79 XR250, 04 CRF50,70's soon to be rebuilt cb750 drag bike.

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,539
  • Bike almost back to the 70's 2015
Re: Cb750 rocker arms and shafts
« Reply #3 on: April 21, 2017, 10:58:58 PM »
Sometimes low miles parts on eBay sold complete with cam holders.
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 Bill/BentON Racing

  • Really Old Timer ...
  • *******
  • Posts: 6,725
  • Ex Honda Service Manager, Cert. Honda Tech - Racer
    • BentON Racing
Re: Cb750 rocker arms and shafts
« Reply #4 on: April 24, 2017, 05:18:07 PM »
I've got lots of shafts.....
BentON Racing Website
OEM Parts | Service | Custom Builds
BentON Racing Facebook
Over 35 years of experience working on vintage motorcycles, with a speciality in Honda SOHC/4 with a focus on the CB750 and other models as well from 1966 - 1985.
______________________________________
1993 HRC RS125 | 1984 NS400R | 1974 Honda CB750/836cc (Calendar Girl) | 1972 CB 500/550 Yoshi Kitted 590cc | 1965 Honda CB450 Black Bomber | 1972 Suzuki T350 | 1973 88cc | Z50/Falcons Pit Bike | 1967 CA100| 1974 CB350 (400F motor)...and more.
______________________________________
See our latest build 'Captain Marvel' CLICK HERE