Had a knock develop over 3 days
Sounds like its from #6 took off the cam cover
Sounds like its from #6 took off the cam cover
Don't think its rust more of a build up of varnish like it hasn't been touching the bucket tappet in a long timeIs that rust i see?
Hmmm, time to bust out the feeler gauges and check the clearance on the bucket. My dirt bike has buckets with shims under them, kind of a pain to adjust as you have to pull the cams out to replace shims.
The build up on the cam is very odd. Even it it wasnt contacting the bucket it remains coated in oil at all times. The only way I can see that happening is if you have a valve sealing issue and its allowing exhaust to come back through valves.
Any chance you have a video of the noise?