GY6 Crankshaft (Complete)

Complete Crankshaft for GY6 125cc/150cc Engines

This crankshaft serves as a complete OEM replacement for GY6 125cc and 150cc scooter engines. Designed for straightforward integration, it is important for maintaining engine function and performance. This part is one of the GY6 scooter parts that can help restore your scooter's power and efficiency. Ideal for riders seeking a reliable solution when OEM options are unavailable or costly.

Key Features

This crankshaft includes main bearings and is engineered for specific engine applications. The stroke measures 57.8mm, allowing for effective performance in your scooter. The overall length is 285mm, with flywheel and drive end thread sizes both at M12x1.25. It is important to note that the piston, pin, and circlips are sold separately but can be found online.

When to Replace Your Crankshaft

Replacing your crankshaft may be necessary when you experience engine performance issues or unusual vibrations. Signs of wear or damage to the crankshaft can lead to decreased power output and efficiency. If you're rebuilding your engine or replacing other internal components, consider renewing the crankshaft for improved performance.

Specifications

• Stroke: 57.8mm
• Overall Length: 285mm
• Flywheel Thread Size: M12x1.25
• Flywheel Thread Length: 14mm
• Drive End Thread Size: M12x1.25
• Drive End Thread Length: 14mm
• Inner Diameter (Piston Pin Hole): 15mm
• Number of Splines: 19
• Main Bearings: Included

Fitment

This crankshaft is compatible with 157QMJ-based 125cc, 150cc, and 169cc engines, including the following engine codes:

• 157QMJ
• 161QMK
• 152QMI
• 1P61QMK
• YN1P57QMJ
• 1P52FMI
• 154FMI
• JJ157QMJ
• 1P57QMJ
• BN157QMJ
• BN161QMK-A

Not sure it fits? Contact us with your scooter's make, model and year and we'll confirm the fit before you order.

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