Valve-Adjusting Nuts (Pair) GY6

Valve Adjusting Nuts for 125cc to 169cc Engines

This two-piece set of valve adjusting nuts is made for certain 157QMJ-based engines, covering 125cc, 150cc, and 169cc versions. They form part of the engine's valve train, where they allow the valve clearance to be set correctly. Browse our GY6 scooter parts for related components. These nuts are a direct swap for ones that have worn down or been damaged.

Why They Matter

The valve adjusting nuts hold the valve clearance in place. With use, they can wear or get damaged, which may affect how the engine runs. Replacing them when they show wear helps keep the engine running smoothly.

Engine Match Notes

This part works with a range of engine models. If the engine identification number includes "QM" or "FM," this product will likely be a match. The engine codes listed below are ones this set is compatible with:

Specifications

• Set: 2 nuts
• Thread Size: M5x0.50
• Fits: GY6 150cc (157QMJ) engine and other 157QMJ-based 125cc/150cc/169cc engines

Fitment

Compatible with:

• GY6 150cc (157QMJ)
• 157QMJ-based 125cc / 150cc / 169cc engines with codes 157QMJ, 161QMK, 152QMI, 1P61QMK, YN1P57QMJ, 1P52FMI, 154FMI, JJ157QMJ, 1P57QMJ, BN157QMJ, BN161QMK-A
• Other QMJ, QMK and QMI engines (codes containing QM)
• Other FM engines (codes containing FM)

How to choose: Pick the thread that matches your valve cover screws, which is M5x0.50. The set contains 2 nuts.

Where it goes: Refer to part #5 on the camshaft and valve diagram for the GY6 150cc (157QMJ).

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