first off thank you for taking time to help me with this problem im having..... recently i purchased a 2000 blaster 200cc quad for my wife everything looked good starts 1 or 2nd kick sounds good fmf full pipe looks awesome.... i was told the previous owner had just put a new weisco piston in her so im thinking this thing will be a great deal well after playing with it a little getting it warm the next day and so on i noticed a tapping sound coming from what i think to be the cylinder it goes away with a little gas and only seems to be at very low idle... ive checked exhaust cause' i am fully aware a small exhaust leak could put off a sound like this but nothing.... so i contacted the previous owner being a douche as expecting stating its as is and needs to be bored .20 over.... that is all he said before hanging up... lol heres my question finally.... lol if you put a piston that is .20 larger than factory and not have the cylinder bored .20 over it wont fit right???? cause this isnt making any sense to me it seems the piston is too small for the bore and im getting what i call piston slap???? if anyone can help me out give me ideas and help me understand what i need to do that would be great.. im mechanically inclined and am confident with taking on a task of pulling this apart put i just dont know what to do if i have to rebuilt top end the right way... order a .20 piston being i want some cyclinder wall so it wont get too hot... and then have the cylinder bored .20 from where it is? is it that easy??? thanks so much and hopefully i havent confused anyone!