GY6 125/150cc Long Case Engine Assembly Kit

GY6 Long Case Engine Assembly Kit for 125cc and 150cc Scooters

This GY6 Long Case Engine Assembly Kit makes rebuilding your engine more manageable for 125cc and 150cc GY6 scooters that use a long-case belt setup. The kit suits models fitted with 12" to 14" wheels. It is one of the GY6 150cc scooter parts supplied with components already installed, which helps you get the engine running sooner and with less effort.

Factory-Fitted Parts

The crankcase bearings and rubber isolation buffers come installed from the factory. You won't need to spend time fitting them or buy special tools to press them into place. It's a simple option for anyone building or replacing an engine who wants to keep the job easy.

Compatibility and Design

The engine case in this kit uses 54mm head stud spacing, so it lines up with compatible engines. Before buying, confirm the stud spacing on your engine, since this case will not work with QMK-based engines. The long-case layout is made for scooters that run larger wheel sizes.

Specifications

• Engine Compatibility: 157QMJ / 152QMI (125cc / 150cc)
• Head Stud Spacing: 54mm
• Case Type: Long case (fits 12"–14" wheels)
• Material: Die-cast aluminum alloy
• Includes: Left & right crankcase halves, 4 head studs, rubber buffers, breather hose, hardware
• Bearings: Factory pre-installed
• Dimensions: 20" L x 12" W x 5" H
• Fits: GY6 125cc and 150cc engines (157QMJ / 152QMI) with 54mm head stud spacing

Fitment

Fits:

• GY6 125cc and 150cc engines 157QMJ, 1P57QMJ, YN1P57QMJ, JJ157QMJ, BN157QMJ (54mm stud spacing)
• GY6 150cc engines 152QMI, 1P52FMI, 154FMI (54mm stud spacing)
• Long-case GY6 scooters with 12"-14" wheels

How to choose: Check the engine code on the crankcase or engine label against the list above, and confirm the head stud spacing is 54mm. This kit is not for QMK engines (161QMK / 1P61QMK).

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