How do you do this: How can you mount a new sprocket on a bicycle and what tools do you use?
locate sprocket on axle hub, cut the rubber isolator to the center, compress the chain sprocket to the spokes, Remove the cover plate from left rear side of engine of the kit, then you must remove the narrow drive sprocket from the engine and install a wider tooth drive sprocket obtained from your dealer to match the 415 chain. Use spark-plug and wrench to turn engine crankshaft sprocket to feed chain around it, fit chain, reconnect the masterlink, adjust the chain, and install the chain guard.