Product Description
Taida 52mm Big Bore Kit (88cc) for 49cc/50cc GY6 139QMB Engines
Increase the performance of your 49cc/50cc scooter with the Taida 52mm Big Bore Kit, engineered in Taiwan for riders looking for exceptional reliability and power. Featuring a premium cast-iron cylinder and cast aluminum piston, this kit is designed to deliver increased torque, stronger acceleration, improved hill-climbing ability, and greater overall engine performance while maintaining excellent durability.
When installed with a stock 41.4mm crankshaft, this kit increases engine displacement to approximately 88cc. Pair it with a 44mm stroker crankshaft to achieve approximately 93.4cc.
Features
- Premium Taida cast-iron cylinder for maximum durability and long service life
- Precision-machined cast aluminum piston
- 52mm big bore design for significant horsepower and torque gains
- Excellent heat resistance for daily riding and performance applications
- Precision-honed cylinder walls promote proper ring seating and reduced friction
- Manufactured in Taiwan for outstanding quality and reliability
Important Installation Information
- Before purchasing, measure your engine case with a caliper.
- Cylinder sleeve outside diameter measures 54.45mm.
- Engine case opening must provide a minimum 54.5mm clearance.
- If your crankcase opening is smaller, engine case boring/machining will be required.
- Professional installation is recommended.
Specifications
- Cylinder Bore: 52mm
- Engine Displacement:
- 88cc with 41.4mm stock crankshaft
- 93.4cc with 44mm stroker crankshaft
- Cylinder Material: Cast Iron
- Piston Material: Cast Aluminum
- Outer Sleeve Diameter: 54.45mm
- Cylinder Height (without sleeve): 53mm
- Overall Height (with sleeve): 70.3mm
- Country of Manufacture: Taiwan
Package Includes
- (1) 52mm Cast-Iron Cylinder
- (1) Cast Aluminum Piston
- (5) 52mm Piston Rings
- (1) Wrist Pin
- (2) Circlips
- Base Gasket
- Steel Head Gasket
- Cam Chain Tensioner Gasket
- Taida Decal
Compatible Components
- Fits 50mm Cylinder Stud Spacing (70.5mm Diagonal)
- Fits 50-52mm 2-Valve Cylinder Heads
- Fits 41.4mm and 44mm Crankshafts
- Fits 8x14mm Dowel Pins
- Fits 64mm or 69mm Rocker Arm Assemblies
- Intake Studs: M6
- Exhaust Studs: M6
- Cylinder Studs: 168mm / 176mm
Vehicle Compatibility
Fits most GY6 50cc / 139QMB 4-stroke engines, including many Chinese scooters and mopeds such as:
- TaoTao
- Ice Bear
- Wolf
- Roketa
- Tank
- SUNL
- Baja
- BMS (Boreem)
- Panterra
- QLink
- Qingqi
- Kymco 4-Stroke 50cc Models
- Lance
- SYM
- And many other scooters using the 139QMB engine platform with matching dimensions.
Please verify all measurements before ordering. This kit is designed for 139QMB/GY6 50cc engines and fitment should always be confirmed before installation.
