So my buddy went and bought a 02 Banshee and the right side compression was off. I noticed it when we were buying it but figured it was probably his piston rings or he wasnt getting good spark on that side. Well i tore his Carbs apart and cleaned them out and we put new gas in the tank and made sure everything was cleaned out because if was bogging pretty bad. Well That didnt fix it so i took his head apart and his right piston was broke and the chunk that broke off is believed to be somewhere down in the cases. I kno i kno he got screwed hardcore but this is his first bike and he needs to learn how to work on and fix his own bike. So as of now we need a new crank, pistons, gaskets, and im hoping that the gears are all good because that lil chunk is still down in there. While were in the engine. What parts do yall recommend for us to upgrade to improve the bikes performance. He is still learning to ride so we r trying to get this thing rolling as fast as we can. But i figured why not ask the masters and see what we can do cheap and easy while we are in there and start building his engine back up. We plan on throwing a stroker crank in it and run stock piston size unless it has to be bored over. i say it needs a good hone and it will be fine. Should it be bored to run a stroker? also at what +-size rod do u have to shave the cylinder so it wont hit and when does the case need to be trenched? Also whats a cool head and are they a pretty good investment? any advice on building this bike back up and getting it running better would be greatly appreciated.