i ran my lt250r and blew the motor bad i seized the lower rod bearing to the crank i used to use standard two stroke oil but i decided to use the smokeless oil i just put a new piston (weiseco) 40 over in about a month ago and thats all i can figure out that was the cause now im installing a hotrods crank and rod from luke racing another piston gasket set oring kit and all the bearing i figure why not the case is split anyway should i see a power improvment and could the smokeless two stroke oil caused my failure when it locked up i was in 3rd just about to to 4th running crazy fast i bought this thing used also for a grand the carb was goofed up i put a 36mm flat slide on it and it came alive i just love this machine it cramps my 350 warrior style every time