i have a 98 blaster that wont run unless u gas it allot and the rpm's are all over the place . i checked the reeds carb and electronics.when i pulled the head off i noticed that the cylender had new crosshaching in it and the piston had some freeplay. the freeplay is about 2mm or so about the size of a machbook or so when i move it side to side is that normal or did someone get it bord and get the rong pistion for it