NCY Cylinder 61mm 171cc Big Bore Kit w/Cast Piston Fit 54mm (GY6)
Description: NCY 61mm 171cc Cast-Iron Cylinder Kit with a Cast Aluminum Piston. Give your GY6 based scooter some serious power with this bolt-on 171.3cc kit for most GY6 125/150cc engines. As far as we know, this is the only 61mm cylinder kit for the GY6 engine that exists in the US. With most 61mm cylinder kits, you have to cut the engine cases in some way to make it fit (Outer Cylinder Skirt Diameter: 65mm). Not so with this kit (Outer Cylinder Skirt Diameter: 62.9mm). It also has a lightweight cut-down piston to increase performance even more. It’s highly recommended to jet this kit significantly rich because of its high-performance capability. To maximize performance and efficiency, it’s recommended to get our 61mm big valve head as well. Some stock heads may not fit.
NOTE: Please, measure with a caliper GY6 crankcase bore (opening) for 62.9mm cylinder outer diameter sleeve need minimum 63mm bore clearance or boring and machining are required.
Includes the following Cylinder, Piston + Rings, Gaskets (compression base gaskets, steelhead gasket), Wrist pin, and Circlips.
• 61mm Cast-Iron Cylinder
• 62.9mm Outer Sleeve Diameter
• 61mm Cast-Alumin Piston
• 61mm Piston Rings
• 61mm Fiber Base Gasket
• 61mm Steel Head Gasket
• Made in Taiwan
• Fit Cam Chain 45 (90) links
• Fit Chain Guide (standard)
• Fit Crankshaft 57.8mm +2.5mm
• Fit Stud Set- 187mm 195mm
• Fit Dowel Pin Set (10x14mm)
• Fit 54mm Stud Spacing (A-Block)
• Fit 54mm Cylinder Head 61mm 2V
• Fit GY6 125/150cc+
• Optional: cut plastic fan shroud for best fitment
Supported Models: GY6 152QMI 157QMJ Chinese Scooter, ATV, Genuine Buddy, Kymco, Ruckus, Vento
Item Weight & Package Dimensions:
• 3.1 pounds | 5.7” (L) x 5.7” (W) x 4.669” (H)