Dose the flywheel have to be cut down and reblanced or can you fly with the stock flywheel also what kind of starter do I need for this engine.

While most cut down the flywheel, it is not really necesssary. Just saves a few ounces. I have used a conventional starter (sullivan) connected to a garden tractor batter (needs the extra amps),but I now have a diy starter made from a lawn tractor starter motor. It starts my 45cc homey effortlessly. Do a search for "JAG engines" for excellent parts. One thing about these conversions is you must respect them. With the large props and power they can do a lot of damage if your not careful.
Good luck, red

You need to have it cut down if you want the power. The fins on the flywheel are fan blades, they are sucking up energy that should be going to the prop. Also do not try to cut this down by yourself, if you ruin the flywheel a replacement will cost you about as much as the engine. I buy my parts from Wacker Engines, I sent the flywheel down to Peter and he takes the fins off on his lathe and balances it for $12. Best of luck with your endeavor.