Cam Chain Tensioner for CSC Go., GY6 50cc (139QMB) Scooters

Cam Chain Tensioner for CSC Go Scooters with 139QMB Engines

This OEM-style cam chain tensioner is made to replace the original unit on CSC Go scooters and motorcycles that use the 139QMB engine. It keeps the right amount of tension on the camshaft chain so the engine runs smoothly. It belongs to the same family of GY6 50cc scooter parts and installs in place of the stock component, so your scooter can return to proper working condition.

Construction and Function

The tensioner's job is to grip the cam chain firmly and stop it from going slack, since slack can cause engine noise or a drop in performance. It measures 7-3/4 inches long and has a 6mm inner hole, matching the original equipment exactly. It is manufactured to the specifications of the 139QMB engine for dependable operation.

When to Replace

Consider swapping out the cam chain tensioner if the engine starts making unfamiliar sounds or if you notice it running worse than before. Inspecting it during routine service makes it easier to spot signs of wear. Keeping this part in good shape supports the engine's overall function.

Specifications

• Size: 7-3/4 inches
• Inner Hole Diameter: 6mm
• Fits: CSC Go, Bella Classic 50, Go Max, Nitro Sport 50 and Pug 50 with 139QMB-based 50cc engines

Fitment

Fits:

• GY6 50cc (139QMB)
• CSC Go
• CSC Bella Classic 50
• CSC Go Max
• CSC Nitro Sport 50
• CSC Pug 50

How to choose: Check the engine code stamped on the engine casing against this list: 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB or 147QMD.

Where it goes: part #2 on the cylinder crankshaft diagram for the GY6 50cc (139QMB), CSC Go; part #2 on the cylinder crankshaft diagram for the CSC Bella Classic 50; part #2 on the cylinder crankshaft diagram for the CSC Go Max.

Shop more: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Cylinder Heads & Valves · Scooter Chains & Sprockets · Scooter Parts