Final Drive Circlip (Transmission) for GY6, Chinese

Final Drive Circlip for GY6 125cc/150cc Engines

This retaining clip is made for the final drive shaft in the transmission of GY6 125cc and 150cc engines. Its job is to hold the gearbox parts firmly where they belong. When you service the transmission, swapping this part out is a sensible step. It is one of the essential GY6 scooter components worth checking during routine upkeep. Because it costs little, it can help you avoid larger repairs later on.

Construction and Function

The circlip has an 18.4mm inner diameter and is designed to work across several engine setups. It keeps the final drive shaft seated correctly, which supports the smooth operation of the scooter's transmission. Checking it regularly and replacing it when needed helps keep performance steady.

When to Replace

Whenever the gearbox is already open for service, it makes sense to replace the circlip as well. It helps protect nearby components from premature wear. Installation is simple, and doing it now can prevent transmission trouble down the road.

Specifications

• Material: OEM
• Size: Inner Diameter 18.4mm
• Position: Transmission Final Drive Shaft
• Fits: GY6 150cc (157QMJ) engines and other 157QMJ-based 125cc, 150cc and 169cc engines

Fitment

Fits:

• GY6 150cc (157QMJ) (transmission final drive shaft)
• 157QMJ-based 125cc, 150cc and 169cc engines (engine 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: Compare the engine code on your engine with the list, or confirm that it contains QM or FM. The inner diameter must be 18.4mm.

Where it goes: part #13 on the transmission diagram for the GY6 150cc (157QMJ).

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