My bike is approaching 90 hours of practice and Race time and I feel like it is time for a new top end. The bike is getting slightly harder to start when it is cold for the first time of the day. I may need 6-8 kicks on the first start of the day. Once warmed up, it always starts 1st-2nd kick. I just checked all my valve clearances and they are all within spec. Intake 1 - .10 Intake 2 - .10 Intake 3 - .15 Exhaust 1 - .20 Exhaust 2 - .20 I cannot find my paperwork where I wrote down the baseline specs when it was new. I always change the oil at least every 6 hours, oil filter change every other oil change, and a clean newly oiled air filter every ride day. I know I need to change the cam chain and figured while I have it apart, I might as well do anything else I need to while in there. Replace piston and rings? I am leaning towards a CP piston and upping the compression to 13.5:1 Good choice?