GY6 50cc (139QMB) Rocker Arm Assembly (Type 2, 69mm)
ITEM# TT-24914
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Description
GY6 50cc and 80cc Rocker Arm Assembly for Type-2 139QMB Engines
This rocker arm assembly is made for Type-2 139QMB engines and works with a 69mm valve stem and a taller cylinder head. It helps the valve train move correctly, which keeps your engine's valves working as they should. You'll find it among GY6 50cc scooter parts, and it is built to match several engine models. Whether you're swapping out a worn piece or looking to keep your engine running well, this assembly is a dependable option.
Build and Fit Details
The assembly stands 26mm tall, so it lines up directly with engines that use 69mm valves. It is designed around the Type-2 139QMB layout, allowing it to sit properly in your scooter's engine. If your engine code includes "QM" or "FM," it should be a suitable match.
Signs It May Be Time to Replace the Rocker Arm Assembly
Think about replacing the rocker arm assembly if your scooter loses performance or the engine shows visible wear. Checking this part regularly can help you avoid larger engine issues and keep your ride steady. Odd noises or a noticeable drop in power are good signs that a new one may be needed.
Specifications
- Height: 26mm
- Valve Length: 69mm
- Fits: GY6 139QMB Type-2 engines with 69mm valves (50cc and 80cc, taller head)
Fitment
Fits:
- GY6 139QMB Type-2 engines (69mm valve stem, taller head)
- Engine codes: 139QMA, 139QMB, 1P39QMB, 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, 147QMD
- Other QMA and QMB models (Type-2)
How to choose: Confirm the valve stem length is 69mm. Type-1 engines use a 64mm valve and a shorter head, so this part will not fit them.
Browse related parts: GY6 50cc Scooter Parts (139QMB) · GY6 Scooter Parts · Scooter Cylinder Heads & Valves · Scooter Parts
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