Blue Line GY6 125/150cc Long Case Engine Assembly Kit

Simplify your next engine build with the Blue Line GY6 Long Case Engine Assembly Kit. Designed for 125cc and 150cc GY6 scooters using a long-case belt configuration (12"–14" wheels), this OEM-equivalent engine case kit comes with the most difficult work already done — bearings and rubber isolation buffers are professionally pressed in at the factory, saving you time and specialized tool costs.

Important: This case uses a 54mm cylinder head stud spacing. Verify your engine's stud spacing before ordering. This case is not compatible with QMK-based engines (161QMK / 1P61QMK).

Model Compatibility

Compatible with 157QMJ / 152QMI-based engines (125cc / 150cc) with 54mm head stud spacing:

• Engine codes: 157QMJ, 1P57QMJ, YN1P57QMJ, JJ157QMJ, BN157QMJ
• Engine codes: 152QMI, 1P52FMI, 154FMI
• Fits long-case GY6 platforms with 12"–14" wheels

Key Features

• Ready to Build: Crankcase bearings and rubber engine isolation buffers pre-installed at the factory.
• 54mm Head Stud Spacing: Correct for 157QMJ / 152QMI engines — not compatible with QMK engines.
• Long Case Design: Fits 125/150cc scooters with long-case belt configuration (12"–14" wheels).
• Complete Kit: Includes left and right crankcase halves, 4 cylinder head studs, rubber engine mount buffers, and breather hose.
• OEM Equivalent: Blue Line direct-fit replacement when OEM parts are unavailable or cost-prohibitive.

Technical Specifications

• Engine Compatibility: 157QMJ / 152QMI (125cc / 150cc / 169cc)
• 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

California Prop 65 Warning: www.p65warnings.ca.gov

• Complete long case assembly: left & right crankcase halves, head studs, buffers, and breather hose
• Factory pre-installed crankcase bearings — no press tools required
• Factory pre-installed rubber engine isolation buffers
• 54mm cylinder head stud spacing — fits 157QMJ / 152QMI engines only (not QMK)

Engine: 157QMJ / 152QMI (125cc/150cc/169cc) | Head Stud Spacing: 54mm | Case: Long (12"-14" wheels) | Material: Die-cast aluminum | Includes: L+R cases, 4 head studs, buffers, breather hose, hardware | Bearings: Pre-installed

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