You can lighten your stock flywheel.... Less rotating mass means that the engine will rev up faster. I believe for every pound of rotating mass you remove is equal to removing 7 pounds from the bike. Its not something you can do yourself... Send it to someone that is a professional and have them do it the right way.. I believe the average cost is 45.00$. I will have pics in a few weeks of my stock flywheel after it has been cut.