Blue Line GY6 Gearbox Rebuild Kit - GY6 125/150

This Blue Line complete gearbox rebuild kit restores the gears and shafts that carry power from the clutch to the rear wheel on GY6 125cc and 150cc scooters. It includes the clutch input shaft, countershaft gear, final-drive gear, and output axle shaft for a stock-replacement gearbox rebuild. The included axle length is designed for models with a rear drum brake and a single rear shock.

Key Features

• Complete gear-and-shaft set: Includes the clutch input shaft, countershaft gear, final-drive gear, and output axle shaft.
• GY6 125/150 application: Stock-replacement configuration for matching GY6 gearboxes.
• Single-shock rear-drum axle: Included output axle shaft is sized for rear-drum models with one rear shock.
• Defined gear counts: 15-tooth clutch input shaft gear, 42/13-tooth countershaft gear, and 40-tooth final-drive gear.
• Defined shaft dimensions: 174 mm clutch input shaft and 134 mm output axle shaft, each with 19 splines.

Technical Specifications

• Brand: Blue Line
• Part number: 1100-1505
• Part type: Complete gearbox rebuild kit
• Engine platform: GY6 125cc / 150cc
• Included components: Clutch input shaft, countershaft gear, final-drive gear, output axle shaft
• Clutch input shaft length: 174 mm
• Clutch input shaft gear: 15 teeth
• Clutch input shaft splines: 19
• Countershaft gear teeth: 42 large / 13 small
• Final-drive gear teeth: 40
• Output axle shaft length: 134 mm (5.25 inches)
• Output axle shaft splines: 19
• Included axle configuration: Rear drum brake, single rear shock

Compatibility

The supplied output axle shaft is not the correct length for dual-shock models or models using disc-brake carriers. Compare the gearbox layout, tooth counts, shaft lengths, splines, and bearing locations with the original components before assembly.

Follow the vehicle's service procedure for gearbox inspection, assembly, and final-drive lubrication.

• Complete GY6 125/150 gearbox gear-and-shaft rebuild kit
• Includes clutch input shaft, countershaft gear, final-drive gear and output axle shaft
• Included axle is for rear drum brakes and a single rear shock
• Dual-shock models and disc-brake carriers require a different axle shaft
• 15-tooth input gear, 42/13-tooth countershaft gear and 40-tooth final gear
• 174 mm clutch input shaft and 134 mm output axle shaft; 19 splines each

Brand: Blue Line; Part number: 1100-1505; Type: Complete gearbox rebuild kit; Platform: GY6 125/150; Includes: Clutch input shaft, countershaft gear, final-drive gear, output axle shaft; Clutch input shaft: 174 mm, 15-tooth gear, 19 splines; Countershaft gear: 42 large / 13 small teeth; Final-drive gear: 40 teeth; Output axle shaft: 134 mm / 5.25 inches, 19 splines; Included axle configuration: Rear drum brake and single rear shock; Dual-shock models or disc-brake carriers: Different output axle shaft required

GY6 125cc / 150cc engines with matching gearbox specifications; Included output axle shaft is for rear drum brakes and a single rear shock; Dual-shock models and models with disc-brake carriers require a different output axle shaft