Part #23 on the Clutch Diagram
Every 2-stroke bike engine kit has a 10 tooth drive sprocket. It is the small drive sprocket behind the drive sprocket case cover that the chain feeds onto from the larger rear sprocket. This sprocket fits 415, but may need to have the teeth filed down if chain catches. The drive sprocket is removed with the drive sprocket removal tool. To uninstall this part simply thread on the drive sprocket removal tool and the part will pop off. Note that to replace this part you may need to replace the keyway as well.
Package includes10 Tooth Drive Sprocket Part Number (See Parts Manual): 3-23 Note: Only Compatible with the 415 Heavy Duty Chain.
what can I say , it works as long as you keep the chain tight ?!
Fit perfectly Great price for exactly what I needed