I will be buying a new engine in a few weeks because my old one was ruined by a thief how put regular gas in it and ran in the rain after the air filter fell off. I got the bike back but it needs an engine. I will be taking it apart to do some mods and upgrade bearings. I want to port match the bottom end and top end transfer ports because the bottom end transfer ports are smaller. Also replace the bearings and stuff the case. How do you stuff the crankcase? Has anybody made a tutorial? Can somebody tell me about the power gains? Also, where did you get your bearings from? I'm on a budget so I don't want to spend more than $30 on the bearings. I will also match port the top end and lighten the piston, I don't want to go to the trouble of balancing the crank. There are a few spots on the piston you can grind away and it will not affect heat transfer or strength. I will make a small tutorial on that. I will also paint it black and file the paint off the edges of cooling fins and stuff so it looks awesome. I will make a build thread when I get the engine. First I need to get some $$ out of the punk who ruined my engine. Very lucky a cop recognized him riding on it so I got his balls in a vice. You can't pay for it? Then you go to jail, dirtbag!