HotCam in my 650L

I had to replace my stock camshaft, so I went with a HotCam. My top-end was very noisy, so I checked and found the camshaft and rocker arms were in need of replacement. While in there, I also replaced the cam chain and tensioner.

Unfortunately, after putting it back together and starting it up, the top-end is still very noisy. Too noisy. The noise is definitely top-end. (I've checked and rechecked the valves.)

All I can think of at this point is noise from one or more worn valve trains. I don't hear any clicking when I rotate the engine by hand, only when it's running. What could be noisy in the valve train? A broken spring?

Back into the engine again...


hello there..

are you sure your cam chain is adjusted correctly...

Does the L have an auto-decompression dealie on it? Those have a rep for being loud at idle...

Could be a number of things, valve guides, decompression actuator, cam chain. Did you pull the head? valve seats, valves could be worn and the culprit of excess noise? :thumbsup:

For some reason the Hotcam profiles generate more noise too. I know everybody thats put them in a CRF says the same thing. You may want to ask that question at HotCams.

Just put mine in and it's just as quiet as the stocker.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now