Rafter, is that on an 80 or 65?
on my polini freespirit I thought it would be fun to make a wheely ped. so I put an 11 tooth sprocket in the front. yeah, it worked for a bit. than at 1100rpm a piece of my ring chipped off and lodged its self in my cranks main bearing... huh, no damage to the cylinder or piston. crazy.