i have a 2003 blster,my piston skirt broke,so i replaced the piston and rings and flushed it out as best as i could.......after rebuild and break in,it would strart right up,but only run at high RPMs,then just quit running,did compression check,only 60 pounds,i was told it may be the crank seals and bearings,if anyone has a idea what the problem PLEASE let me know.