The bike is from 2002.. I'm not using a bigbore-kit like athena or something, I'm going to bore the stock cylinder with help from a local shop who's doing that kind of engine work.. I've got the newer crank from rm125 04-10 couse wiseco does'nt produce 58mm pistons for the 01-03 RM..
When I get the piston its time to modify the crank to make clearence for the larger 58mm piston.. Need to check out the clearence for the exhaust valve too, does anyone know if this is a problem when you big bore the rm:s? Have read all info on Eric Gorr's webpage but I didn't find any info about that...
We would also do some cylinder porting for mid-top.. A V-force3 reed valve will help the bottom too..