NCY Cylinder 52mm 88cc Big Bore Kit w/Cast Piston (139QMB)
Description: NCY 52mm 88cc Cast-Iron Cylinder Kit with a Cast Aluminum Piston for 139QMB. Want a real screamer? Then this 88cc big bore kit for you, although it’s not a bolt-on item for most 139QMB bikes. Most of the time, engine cases must be cut. Order Part# 1400-1001, Engine Bore Tool if there is no access to a machine shop. It’s also recommended to get Part# 1100-1435, 52mm big valve head as well, as some stock heads may not fit.
Have a look at our Decompression Tube Assembly which replaces your dipstick and allows excess crankcase pressure to be released. Good idea to install one of these alongside any cylinder kit upgrade.
NOTE: Please, measure with a caliper QMB crankcase bore (opening) for 52mm cylinder outer diameter sleeve 54.5mm need a minimum 55mm bore clearance or boring and machining are required.
Includes the following Cylinder, Piston + Rings, Gaskets (compression base gaskets, steelhead gasket), Wrist pin, and Circlips.
• 52mm Cast-Alumin Piston
• 52mm Piston Rings
• 38x13x9mm Wrist Pin
• 52mm Cast-Iron Cylinder
• 54.5mm Outer Sleeve Diameter
• 53.66mm Cylinder Height
• 71.23mm Overall Height
• Fit 64mm Rocker Arm Assembly 2V
• Fit 50mm Stud Spacing /Diagonal 70.5mm
• Fit 64mm Cylinder Head 52mm
• Fit Dowel Pin Set (8x14mm)
• Fit QMB 49/50cc+
Supported Models: GY6 139QMB 49cc-50cc engines, Buddy50, Filly 50, Kymco, QLink, RoughHouse, SYM, TaoTao
Item Weight & Package Dimensions:
• 1.869 pounds | 5.7” (L) x 5.7” (W) x 4.669” (H)