Oil Pump Nut (Sprocket) for GY6, Chinese

Oil Pump Nut for GY6 125-150cc Engines

This oil pump nut, made for GY6 engines, holds the oil pump gear firmly to the oil pump assembly. It suits a range of 125cc and 150cc engines, so it is a dependable option for upkeep and repair work. It is one of the simpler GY6 scooter parts to swap out at home, helping your engine keep running smoothly. The nut works with several engine codes, so it covers a variety of repair jobs.

Function and Importance

This M6x1.00 nut plays an important role in keeping the oil pump system in your engine intact. It keeps the oil pump gear locked in place so it cannot slip, which could otherwise cause problems with oil flow. Checking this component regularly and replacing it when needed helps the engine perform well.

When to Replace

If you spot an oil leak or hear unusual sounds from the engine, the oil pump nut may need a look. Wear or damage to the nut can affect how the oil pump works, and the pump is central to lubricating the engine. Dealing with these symptoms early helps keep the engine in good condition.

Specifications

• Thread Size: M6x1.00
• Overall Outer Diameter: 13.6mm
• Height: 5.75mm
• Fits: GY6 150cc (157QMJ) engines and other 157QMJ-based 125cc/150cc/169cc engines

Fitment

Fits:

• GY6 150cc (157QMJ) (oil pump gear nut)
• 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 (engine code contains QM or FM)

How to choose: Confirm the nut's thread matches your oil pump shaft: M6x1.00, with a 13.6mm outer diameter and 5.75mm height.

Where it goes: part #5 on the oil pump diagram for the GY6 150cc (157QMJ).

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