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  1. O

    Clutch Knocking

    Agreed, you can still hear the knock at low rpm, but it's certainly much better than it was.
  2. O

    Clutch Knocking

    Sorry, quick correction, I got the clutch isolator kit from vintagecb750.
  3. O

    Clutch Knocking

    Regarding the clutch knock, I had the same issue on my '82 custom. There are two sets of rubber isolators that you need to consider. The first set is in the main shaft, the one that connects the primary chain to the clutch. The second is in the clutch housing. I first tried rebuilding the clutch...
  4. O

    Idle runaway when I blip the throttle

    Reporting back on the clutch job. I put in the new clutch damper kit and B plate and it made a big difference. It didn't totally knock out the rattle, but I would say it is 75% better. I noticed that on the old clutch, I could turn the clutch gear back and forth and feel the slop which went away...
  5. O

    Cam cover helicoils

    I'm looking to repair a stripped out cam cover bolt on an '82 CB750. Can someone tell me what helicoil I need to do the job, is it an M6 x 1?
  6. O

    Idle runaway when I blip the throttle

    I've got 10W-40 in there now while I break in the new rings. I assume that oil circulation and shifting is still acceptable with the 20W-50? I will try the clutch mods first as I'm curious to see how much of a difference it makes. If I still have rattling issues, I'll give the heavier weight...
  7. O

    Idle runaway when I blip the throttle

    Thanks for the tip. Since I don't feel like cracking open the clutch multiple times, I think I will go ahead and replace that plate as well when I swap out the dampers. I have the idle set right around 1100. The rattle goes away at somewhere around 1500 but I don't feel comfortable running the...
  8. O

    Idle runaway when I blip the throttle

    Okay, reporting back on this one. I received my vacuum kit and went to work on syncing the carbs. I was surprised at how sensitive the throttle and idle is to the carb sync adjustment. In any case, I took my time and got the 4 carbs to align pretty nicely on the gauges, with the vacuum...
  9. O

    Idle runaway when I blip the throttle

    Thanks for the advice guys, I really appreciate it. I bypassed the vacuum valve just to rule that out - it's not that as you suspected. She behaved a little better today so I took her out for a little test ride and under load the idle problem was much better. But I did hear some knocking on the...
  10. O

    Idle runaway when I blip the throttle

    I've been searching high and low for the vacuum leak but no luck. I put new rubber manifolds between the carb and block and those pass the spray test. The throttle snaps back cleanly when I roll it on and off with a little slack in the cable, but can you tell me more carb sync. I haven't synced...
  11. O

    Idle runaway when I blip the throttle

    I recently finished rebuilding a 1982 CB750C; body, electrical, engine, carb, etc. I fired it up for the first time the other day and boom - she came to life. That was cool. Everything seems to be okay except for a problem with the idle/throttle. I can start the bike and it idles okay, but when...
  12. O

    New member, 1981 CB750K

    Three sites that I like for Honda CB750 parts: https://www.vintagecb750.com/ https://4into1.com/ https://www.partsnmore.com/parts/honda/cb750c
  13. O

    Cam chain tensioner spring rubber tubes

    Does anyone know why the springs on the cam chain tensioners A and B have rubber tubes over them? I am wondering if I can put the engine head back together without these - they are hard to find. 1982 Honda CB750 Engine.
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