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Taida 52mm Big Bore Kit (88cc) for 49cc/50cc GY6 139QMB Engines
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.
Premium Taida cast-iron cylinder for maximum durability and long service life. 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.
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. 88cc with 41.4mm stock crankshaft. 93.4cc with 44mm stroker crankshaft.
Outer Sleeve Diameter: 54.45mm. Cylinder Height (without sleeve): 53mm. Overall Height (with sleeve): 70.3mm.Fits 50mm Cylinder Stud Spacing (70.5mm Diagonal). Fits 50-52mm 2-Valve Cylinder Heads. Fits 41.4mm and 44mm Crankshafts.
Fits 64mm or 69mm Rocker Arm Assemblies. Cylinder Studs: 168mm / 176mm. Fits most GY6 50cc / 139QMB 4-stroke engines, including many Chinese scooters and mopeds such as.
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.