52.4mm GY6 125cc Piston - 125cc (152QMI) Scooters

52.4mm Piston for GY6 125cc Scooters

This 52.4mm piston is a drop-in replacement for GY6 125cc (152QMI) scooters. It helps bring back proper compression and output when the original piston is worn or damaged, and it is well suited to top-end rebuilds. You will find it listed with GY6 150cc scooter parts, which makes it straightforward to swap during routine maintenance. It is made for 4-stroke engines built on Honda's GY6 layout.

Construction and Design

The crown is flat with a shallow dish in the center, matching the combustion chamber of the original engine. There are three ring grooves: two for compression rings and one for oil control, which together support lubrication and steady performance. Clear orientation marks are cast into the piston to show how it should be fitted.

Installation Considerations

When fitting the piston, point the "IN" mark toward the intake side and aim the arrow toward the exhaust. Piston rings and circlips should be replaced at the same time. Before putting the engine back together, check the cylinder bore for wear or scoring so that new problems are not introduced.

Specifications

• Piston diameter: 52.4mm
• Wrist pin diameter: 15mm
• Ring grooves: 3 (2 for compression, 1 for oil)
• Crown design: Flat top with shallow center dish
• Engine stroke: 57.8mm
• Displacement: 124.6cc
• Engine type: GY6 125cc 4-stroke (152QMI)
• Includes: Piston only
• Fits: GY6 150cc (157QMJ)

Fitment

Fits:

• GY6 150cc (157QMJ)

Where it goes: refer to part #3 on the crankshaft and piston diagram for the GY6 150cc (157QMJ).

Shop more: GY6 150cc Scooter Parts (157QMJ) · GY6 Scooter Parts · Scooter Pistons & Piston Rings · Scooter Parts