Trying to get a 81 rm125 running to race in a vintage class we have going on. bike had new .030 piston installed 25 years ago, and was never started again. I have spark, and fuel(maybe too much). removed carb and totally cleaned and blown out. removed cyl. and checked reeds and overall condition. Bottom end feels really good, problem is i cant get this thing to light whatsoever. the piston is a full-skirt design, and im wondering if the lack of skirt cutouts on the piston is affecting the ports in any way?? thanks in advance for all replies.