Chain Tensioner For Razor MX500 MX 650&SX500 Dirt Rocket RSF650 Electric Bike wa
For Razor MX500, MX 650&SX500 Dirt Rocket, and fit for Razor RSF650 Electric Sport Bike. CHAIN TENSIONER W15128190079 For Razor MX500 MX650 Dirt Bike. 49cc 80cc Engine Pulley Chain Tensioner Roller Idler for Motorized Bike Bicycle.