GY6 50cc (139QMB) Cam Chain Tensioner Kit

Cam Chain Tensioner Kit for 139QMB 50cc Scooters

This tensioner kit suits the 139QMB 50cc four-stroke engine used in a range of scooters. Its job is to keep the timing chain at the right tension so the engine runs dependably. It is one of the useful GY6 50cc scooter parts for keeping your engine in good working order. The kit takes the place of the current adjuster hardware at the cylinder and controls chain movement while the engine runs.

What's in the Box

You get the tensioner body, a spring, a cap, a gasket, an O-ring, and two mounting bolts. The parts are meant to operate together so the timing chain stays adjusted correctly. Installation is simple, and the components are built to last so the engine keeps performing consistently.

Fitting and Swapping Out the Old Unit

This tensioner is made for the 139QMB engine family only. Before you swap out your existing cam chain tensioner, confirm that the original unit and its mounting layout match this kit. If the engine starts making unusual sounds or shows a drop in performance, this component is worth inspecting.

Specifications

• Part Type: Cam-chain tensioner / adjuster assembly
• Engine Family: 139QMB / QMB139 50cc four-stroke
• Appearance: Metal body with two mounting bolts; includes spring, cap, gasket, and O-ring
• Note: Cam chain is not included.
• Fits: 139QMB / QMB139 50cc four-stroke GY6 engine, with the matching two-bolt cam-chain tensioner mount

Compatibility

Compatible with:

• 139QMB / QMB139 50cc four-stroke engine (two-bolt tensioner mount)

Selection tip: Compare your original tensioner and its mounting layout with this kit, and confirm your engine is a 139QMB / QMB139 50cc four-stroke.

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