NCY Engine Case Boring Tool - GY6 125/150cc

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 <