Ok guys this is my second conversion engine a 31cc ryobi to go into a 1/4 spacewalker any thoughts on this plane/combination? but the real question my motor seams to have a heck of a vibration near 3/4 throttle seemingly smooth on the bottom great idle and on top runs out strong. I have faced the flywheel aff and have balenced it in my prop balancer as well as the prop. I know that this is a hard thing to ask as I cant be specific about how much vibration but is this the nature of the beast at this throttle setting or should I keep looking for a cause thanks a bunch for any and all comments