I was wondering how difficult it is to install a new piston on a 2008 YZ450? I am a fairly competent mechanic. I had a WR450, 06 YZ450 now an 08, I have adjusted the valves on all these bikes, pulled the carb a million times, replaced the timing chain ect..... Is there a good step by step link somewhere? YES! I have the manual..... Any advice? In the past I have paid a local guy to do it for a couple hundred bucks.