Same problem!!
I too bought one of the 80cc boygofast kits and have the same problem the chain fits on the engine sprocket but even after considerable filing to remove burrs and sharp edges from rear sprocket chain just won't lay right. (wrong pitch)
I too bought one of the 80cc boygofast kits and have the same problem the chain fits on the engine sprocket but even after considerable filing to remove burrs and sharp edges from rear sprocket chain just won't lay right. (wrong pitch)