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dohc top end rattle

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dohc top end rattle

events
14 posts
This post was updated on Oct 18, 2010; 8:42pm.
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Re: dohc top end rattle

LukeM
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1502 posts
We'll need a little more detail:  what year, is there oil, has it been changed lately, have you done any maintenance to it since you got it, chains tensioned, valves adjusted, carbs worked on/synchronized...

You said high rpm running...are we talking at or near redline? in all gears or just low or high ones?

Usually it's an oil supply issue, or lack of it, to a bearing or somesuch.  That's a first guess.  I'm sure others with better knowledge will chime in.

Luke M
Used to have a 1979 CB750L, sold it as a parts bike, now riding a slightly modified 1984 VT700C. Network/Field Engineer. Central OH, USA, Earth, Sol System, Milky Way Galaxy, Universe.
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Re: dohc top end rattle

Re-run
Administrator
3494 posts
In reply to this post by events
As luck suggested, top end noise can be from mis-adjusted valves. They are possibly too loose. Cam chain noise can also cause some top end rattle.
If you don't have it, get the manual and it will show you how to adjust the cam chain. From there, you can adjust the valves. You will probably need some shims.

Check oil level and if it has been a while since a change, it might be time again. When draining, check the oil for foreign material.
The ride IS the adventure. The destination is just to get gas!