My RMZ needs a Shrink (a.k.a. Head Doctor)

[Rauven]

My 2005 RMZ 450 still doesn't sound perfectly in-tune after changing the shims to the correct clearance, making sure the timing chain tensioner is working and setting the timing 100%. The bike starts fairly easy (5 kicks when cold, 1 - 3 kicks when hot.) Is there anything else I can check to get rid of the knocky noise in the head and get it more smooth?

 

[Rauven]

It's the "normal" valve noise which I am not so sure about. Under full throttle the engine sounds much better, ie. much less knocking noise. We are 1600 meter above sea level and use 93 unleaded octane.

 

[earl pittz]

Do you need to replace the piston?

 

[RMZRyder]

Take it to a bike shop and let a mechanic listen to it. If it is serious let them fix it before it gernades. DONT RIDE IT ANYMORE til you have it checked out. It will cost you a lot more to get it fixed if you continue riding it and the motor lets go. Right now major repairs like new piston or bottom end will be a lot more inexpensive while the motor is still in tact. (notic I didnt say cheap)