A 1986 Honda CR 125 is a two-stroke 124 cc motocross dirt bike. The drive sprocket on the bike is the sprocket that is connected to the transmission on the left side of the engine. The drive sprocket transfers the power from the engine to the rear wheel sprocket, which powers the rear wheel and drives the bike. The drive sprocket is connected to the transmission by one nut and is in clear view on the side of the engine.
Tools Used: Motorcycle jack, Pliers, Ratchet, 1/2-inch socket, Replacement socket
Change the Drive Sprocket
Raise the entire frame off the ground with a motorcycle jack. Remove the rear wheel's axle nut on the side of the swing arm with pliers. The nut is on the end of the swing arm at the point where the rear wheel connects to the swing arm, in clear view.
Push the CR's rear tire toward the engine to give slack in the drive chain. Remove the drive chain from the drive sprocket. The drive chain wraps around the spikes on the drive chain and you can just pull it off the sprocket.
Remove the 1/2-inch nut from the center of the drive sprocket using a ratchet and socket. The nut must be turned counterclockwise. Once the nut is removed, then you can pull the drive sprocket off the transmission.
Place the new drive sprocket onto the transmission and replace the nut. Tighten the nut until it is tightly secured to the transmission.
Place the drive chain onto the new sprocket and push the rear wheel away from the engine to tighten the chain. Replace the axle nut and tighten it until it is snug. Lower the CR 125 to the ground.
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