The diameter of the circle formed by the holes for the 9 bolts on this sprocket is smaller by about .5 cm on this sprocket from the 44 tooth sprocket I received with my 66 cc kit. Fortunately, after compressing the rubber parts on the mounting kit and forcing the screws in at an angle, I was able to mount it - albeit in a way that negatively affects the integrity of the screws in the long term. The metal half-moon pieces create a larger diameter on the inside of the spokes as well so the screws are mounted at an angle with respect to the sprocket - meaning the heads and bolts securing it in place aren\'t flushly mounted. Switched out the Chinese bolts with heavy-duty American made ones and it should last hopefully. Did get a nice boost in low end acceleration ultimately! Motor doesn\'t bog down occasionally as it used to which means there is less strain on it which should help the life of the engine.

That's way more clever than I was expecting. Tahnks!