I eat my R6
Join Date: Dec 2014
Location: Southwest Ohio
Bike: 2008 Yamaha YZF-R6s Stock
Re: Weird noise when clutch is let out
That's *extremely* high risk in my mind. One *must* eliminate that as a possibility.
If that were mine and I were reasonably sure the noises were originating from the timing cover area, (consulting the manual for details,) I'd pull the chain cover off at the crankcase, pull the valve cover off, spark plugs out, turn the engine manually at the crank while visually inspecting everything (guides, sprockets, chain, tensioner) for at least one full rotation. Then (consulting the manual for details,) I'd remove the timing chain tensioner, operate and inspect it; test if at all possible. I'd touch, inspect and possibly remove all three chain guides for deeper inspection. Memory serving, the manual identifies some details on inspecting the timing chain and sprockets for wear, damage, play. If not, there are general procedures for identifying chain and sprocket wear online.
Keep in mind that the cams and crank, should not be allowed to rotate independent of each other or damage will result. Take great care before releasing the tensioner. "Tension" created by valve springs and engine compression can generate sudden movement.