NCY Engine Case Boring Tool - GY6 125/150cc
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Engine Builder Precision: NCY GY6 Case Boring Tool
Push the limits of your GY6 engine with the NCY Case Boring Tool. When upgrading to extreme big-bore kits (such as 61mm or 63mm cylinders), the stock engine case diameter is often too small to accept the larger cylinder skirt. This professional-grade tool allows you to precisely machine the engine case to the perfect clearance, ensuring a seamless fit for high-displacement performance upgrades.
Technical Performance Features
- Professional Machining at Home: Designed to eliminate the need for expensive machine shop services, allowing builders to bore their own cases with precision and consistency.
- Adjustable Cutting Diameter: Engineered specifically for GY6 125cc and 150cc (QMI152/QMJ157) engine blocks to facilitate 170cc, 180cc, and larger conversions.
- Guided Stability: The tool's pilot design ensures the bore stays perfectly centered with the crankshaft axis, preventing sleeve misalignment and potential engine failure.
- Hardened Steel Cutting Bit: Features a durable, high-speed steel cutter capable of shaving through cast aluminum cases with minimal heat buildup.
Comprehensive Fitment Guide
This specialized tool is compatible with a wide range of GY6-based and Taiwanese-manufactured engines, including:
| Brand / Series | Popular Models |
|---|---|
| GY6 Engines | All 125cc/150cc QMI152 & QMJ157 Engines |
| Genuine Scooter Co. | Buddy 125, Buddy 150, Blur 150 |
- Not compatible with crankcases with 57mm stud spacing
Technical Specifications
- Engine Type: GY6 125cc - 150cc (4-Stroke)
- Tool Type: Manual Case Boring / Machining
- Manufacturer: NCY (Made in Taiwan)
Mechanic's Note: Case boring is a critical process. For the best results, Scooterworks recommends using a drill press or a high-torque hand drill equipped with a clutch to prevent binding. Always clear aluminum shavings thoroughly from the crankcase before reassembly to prevent bearing damage.
Part Number: 1400-1015
Certification: ISO 9001 Certified
The NCY Case Boring Tool is a must for most large bore projects on GY6 cylinders (up to 67mm) and other model cylinders (up to 72mm).
Specifications:
- Not compatible with a 57mm stud spacing crankcase
Compatibility:
| RS 100 | SUPER-4 100 |
| JOG 100 | GTR 125 |
| GTR AERO 125 | RS ZERO 100 |
| RS Z-100 | BWS 125 |
| BWS 125 X | NEW CYGNUS 125 |
| CYGNUS 125 | CUXI 100 | <
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