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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: 10mm
•    Fit Exhaust Studs: M6 / Nuts: M6 Socket: 10mm
•    Fit Rocker Arm Assembly: 64mm or 69mm / Feeler Gauge: .004in / .005in / Socket: 9mm
•    Fit Cylinder Studs: 168mm 176mm / Nuts: M7 / Washers: M7 / Side Bolts: M6 / Socket: 8mm-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: 139QMB 49cc-50cc engines, Baja SC50, Boreem (BMS) 50, Filly 50, Kymco 50, Panterra 50, Qingqi 50, QLink 50, Roketa 50, SUNL 50, SYM 50, Tank 50, TaoTao 50, and virtually any other scooter engine with these measurements.

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: 38
  • Reward Points: 10
  • Part #: 3113243
Sold: 2
Views: 14114
Ex Tax: $269.95
Price in reward points: 256