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Malossi Cylinder 52mm 88cc Big Bore Kit w/Cast Piston (139QMB)

Malossi Cylinder 52mm 88cc Big Bore Kit w/Cast Piston (139QMB)

Description: Malossi Cylinder 52mm 88cc Big Bore Kit w/Cast Piston in aluminum with hard chromed liner for 139QMB 49/50cc 4-stroke Chinese Scooter. The bore = 87.9cc capacity. The original head may be retained according to the manufacturer, but only super unleaded should be used due to the compression ratio. Solid 4-stroke cylinder made in Europe. Suitable for Chinese-built 4-stroke and Kymco 4-stroke engines. Cylinder skirt diameter = 54.5mm

It’s also recommended to get a 52mm big valve head (Part# NK100.13) in order to take full advantage of the bigger piston valve notch. However, you can use the original stock cylinder head without any problem.

When used in conjunction with a stock stroke of 41.4mm the engine displacement comes out to 88cc! When used with a 44mm stroker crank, engine displacement = 93.4cc!

NOTE: Please, measure with a caliper 139QMB crankcase bore (opening) for 54.5mm cylinder outer diameter sleeve need a minimum 54.6mm bore clearance or boring and machining are required. If, engine case must be bored, order an engine bore tool (Part# 1400-1001).


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

•    1x Cast-Alumin Piston: 51.48mm
•    5x Piston Rings: 52mm
•    1x Wrist Pin w/G-clips: 38x13x9mm 
•    1x Cast-Iron Cylinder: 52mm
•    Outer Sleeve Diameter: 54.5mm
•    Cylinder Height (w/o sleeve): 53mm
•    Overall Height (w/sleeve): 70.3mm
•    Made in Italy
•    Fit Intake Studs: M6 / Nuts: M6 Socket: 8mm
•    Fit Exhaust Studs: M6 / Nuts: M6 Socket: 8mm
•    Fit Rocker Arm Assembly: 64mm or 69mm / Feeler Gauge: .004in / .005in / Socket: 9mm
•    Fit Cylinder Studs: 168mm 176mm / Nuts: M7 / Washers: M7 / Socket: 10mm
•    Fit 50mm Stud Spacing /Diagonal 70.5mm
•    Fit Cylinder Head 50mm to 52mm 2V
•    Fit Crankshaft 41.4mm to 44mm
•    Fit Dowel Pin Set (
•    Fit QMB 49/50cc+

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

Item Weight & Product Dimensions:
•    1.437 Pounds | 4.463" (L) x 4.156" (W) x 2.767" (H)

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Malossi Cylinder 52mm 88cc Big Bore Kit w/Cast Piston (139QMB)
  • Stock: 40
  • Reward Points: 10
  • Part #: 3113243
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Price in reward points: 256