it could be your cylinder if u go as fast as you can all the time it will blow up your cylinder take the cylinder off and run your finger around the bore if it has a scratch on it or a cut it has blown up if the cylinder is fine cheak your carb take the carb off and open it up at the bottom the the jets out ( the little screws) and make sure nothing is bloking them tel me know how u get on
the fixer
May 2008