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 number 1400-1001, Engine Bore Tool if there is no access to a machine shop. It’s also recommended to get part number 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 54.85mm cylinder outer diameter sleeve need minimum 55mm bore clearance or boring and machining are required.

Specifications:

Includes the following Cylinder, Piston + Rings, Gaskets (compression base gaskets, steel head gasket), Wrist pin, and Circlips.

•    52mm Cast-Alumin Piston
•    52mm Piston Rings
•    38x13x9mm Wrist Pin
•    52mm Cast-Iron Cylinder
•    54.85mm Outer Sleeve Diameter
•    53.66mm Cylinder Height
•    71.23mm Overall Height
•    Fit 50mm Stud Spacing
•    Fit Cylinder Head 50mm to 52mm
•    Fit QMB 49/50cc+

Supported Models: GY6 139QMB 49cc-50cc engines, Buddy50, Filly 50, Kymco, QLink, RoughHouse, SYM, TaoTao

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Item Weight & Package Dimensions:
•    1.869 pounds | 5.7” (L) x 5.7” (W) x 4.669” (H)