At the top on the right hand side there is a search bar ,you can find info there on just about any engine.When you do enough to the engine it could rev three times what it could when it was stock. That will make the flywheel explode and that could kill you or someone else,that is why you need an aftermarket flywheel and it also gives you adjustable ignition timing ,you need the flywheel if you are going to race it,they won't let you race without it Marc birdman exprss who is a moderator on this site is also an Arc dealer ,he can get you the parts you need,you need an aftermarket connecting rod too,the stock one won't take much RPM