Hi! I am a proud owner of a 2009 crf 250 and it's definitely the best bike I've had, so much progress I made with it and the quality is awesome, I mounted loudmouth and jd jetting kit, the bike is working great so far. It starts without problems cold or warm, I've never check the valves ... Now it has 30 hours and I am gonna change the piston and rings to be on the safe side, which size of piston do you guys used after that amount of hours? Of all the stores I checked it seems that 78 mm is the most common (I want to use wiseco), is that ok or too big? Should I go for 77.95 instead? I am gonna check the valves, if it's not ok can I just change the titan valves or do I need to fix the valves seats?? Thank you!