RE: another darn ryobi post (ryobi performance modification, analysis and comparison)
A friend of mine carefully broke the fins off just above the surface of the flywheel, then ground them down flush, and polished the flywheel. Then I balanced it on my Dubro prop balancer. It is on a Homelite 25cc that I souped up for him. He likes how it runs/flies with a 15 x 8 prop, and it turns over 9400 rpms. He has been flying it for a couple of years now with no problems...
AV8TOR