The reason i tore it down was the presence of a severe vibration that seemed to involve the entire bike especially the handlebars. My fear is that the crank is not true, or severely imbalanced. I have seen where completely new cranks did not have the proper runout. It appears that the piston is really moving front to back in the thrust regions of the cylinder. Would the vibration have something to do with this? However, all piston and cylinder dimensions are in spec. For now. But it does weigh about 3 oz. less than the OEM.
Another issue is the oil leaking into the combustion chamber. Upon inspection the valves are wearing at the face, especially the intake valves. The exhaust valve faces are pitted and oily. Bottom line is its time for a head job, new valves, seats, ....
But i am very discouraged with the appearance of the cylinder and the vibration. In my opinion i have only one choice, and that is to pull the crank and have it inspected and trued. Hell for more money i may even have it balanced to vibrate out of my usual operating rpm range, as i well know that single piston setups are never perfectly balanced.
I really would appreciate some advice, but i think i know what the writing on the wall will be. Would just like some reassurance that i am doing the right thing. Thanks in advance!!! Here are the pics. I'll try to make them small enough yet still be useful.
For videos and all pics please visit http://s1354.photobu...681/drjclark63/
Edited by coop63, November 20, 2012 - 06:30 PM.