Author Topic: 1976 750 F Clutch Issues  (Read 850 times)

0 Members and 1 Guest are viewing this topic.

Offline timmckinney

  • Full Member
  • *
  • Posts: 3
1976 750 F Clutch Issues
« on: June 14, 2016, 01:17:32 PM »
Just bought a beautiful 1976 750 F Super sport that is completely original down to the paint and exhaust. Bike runs great but clutch refuses to release, no matter what I try. I have pushed to get rolling and then started the bike, tried on and off the throttle hard with clutch lever pulled and going to a higher gear and really pulling down on the engine, nothing has worked. The previous owner tells me that it was fine last fall. I find it hard to believe that in one winter it has frozen up this badly! Suggestions, not a great mechanic.

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,289
Re: 1976 750 F Clutch Issues
« Reply #1 on: June 14, 2016, 02:59:03 PM »
If the cork plates are original, they probably are needing replacement.  It really is quite simple.
watch this for a good how-to from forum member Dino:
'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline timmckinney

  • Full Member
  • *
  • Posts: 3
Re: 1976 750 F Clutch Issues
« Reply #2 on: June 15, 2016, 07:08:38 AM »
Have never seen clutch plates stuck together hard enough that actually riding the bike and putting the clutch under a heavy load wouldn't free them up? Wondering if I have other issues. Where can I buy a clutch tool/

Offline flybox1

  • My wife thinks I'm a
  • Really Old Timer ...
  • *******
  • Posts: 14,289
Re: 1976 750 F Clutch Issues
« Reply #3 on: June 15, 2016, 07:17:14 AM »
Yeah...you can put the bike in gear and get a few friends to push. 
I did that with my K8 and it broke loose, but so did the cork pads from their plates.



Clutch tool:
https://www.jakewilson.com/p/4871/-/977317/Motion-Pro-Clutch-Hub-Spanner?v=12399&gclid=Cj0KEQjw-YO7BRDwi6Stp7T296ABEiQAD6iWMYOlHnulR5R7PdN3arwwDpCgntWgU8PnCZYVDLs32LkaAqoH8P8HAQ




'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline timmckinney

  • Full Member
  • *
  • Posts: 3
Re: 1976 750 F Clutch Issues
« Reply #4 on: June 15, 2016, 08:26:24 AM »
I have pushed the bike to get it rolling and then started in, rode it for about 3 miles running every stop sign at low speed because the clutch would not break loose. Have never had a clutch stick so hard it would not break loose under a heavy load.

Offline ekpent

  • Really Old Timer ...
  • *******
  • Posts: 13,508
  • To many bikes-but lookin' for more
Re: 1976 750 F Clutch Issues
« Reply #5 on: June 15, 2016, 08:31:06 AM »
 Usually they break free pretty quickly when the engine is started and good warm oil circulates, never had one as bad as yours. In the meantime while you decide your next course of action tie the clutch handle back to the handlebar to keep the pressure on full time. Trying warming the engine good again with it tied back also.