Motor Tensioner for Razor MX650/MX500/SX500/Rsf650

This heavy-duty motor tensioner is precision-designed for the Razor MX650, MX500, and SX500 electric dirt rocket models. Machined from 0.125‑inch (3.2 mm) stainless steel plate, the tensioner provides a rigid mounting interface that resists bending and flexing under heavy load. It includes a spacer and one M6×20 mounting bolt to align and secure the motor at the correct height. The robust steel construction and corrosion-resistant finish ensure reliable long-term performance in rain, mud, and harsh off-road conditions. Overall, this tensioner delivers improved drivetrain stability and consistent chain/belt tension for demanding ride conditions.

Key Features

• Model Compatibility: Direct-fit for Razor MX650, MX500, and SX500 dirt bikes (with MY1020-style motors). Mounts to the stock motor bracket without modification, ensuring perfect alignment with the rear sprocket.

• Heavy-Gauge Steel: Fabricated from 0.125″ (3.2 mm) thick cold-rolled steel for exceptional rigidity. The thick steel plate resists flex under torque, providing the strength and reliability needed for intense off-road use.

• Included Hardware: Supplied with a precision-machined spacer and one M6×20 mounting bolt. These hardware pieces set the motor spacing correctly and firmly clamp the motor to the tensioner, making installation straightforward.

• Durable Construction: The tensioner’s robust steel body features a corrosion-resistant finish. It stands up to rain, mud, and the rough terrain of off-road riding, ensuring long-lasting durability.

• Performance Reliability: By securely anchoring the motor and maintaining precise chain alignment, this tensioner minimizes chain slippage and vibration. The result is smoother power transfer and reduced drivetrain wear during aggressive acceleration or uneven terrain.