Malossi Big Bore Racing Cylinder Kit for Kymco 4 Stroke

85cc Malossi Racing Big Bore Aluminum Cylinder for Kymco 50cc Scooters. The best cylinder on the market for your 50cc GY6 or QMB139 Engine. Nikasil Lined.  M3113243




Material: primary aluminium alloy with a high content of hardened and tempered silicon, cylinder liner with silicon carbide coating in a galvanic nickel die and crossed smoothing with two diamond passages with very limited tolerances.
Machining: on machine tools with high precision numerical control.
Cylinder-piston connection with an allowance of 0.05 mm.
Recalculated and upgraded heat exchange surfaces.


Ultra compact with 3 rings.
Material: special aluminium alloy with high silicon content, low thermal expansion and a tin facing on the sliding surfaces.
Machining on machine tools with numerical control.
Lightened and reinforced.
Upgraded heat exchange surfaces.

Piston rings

Compression - special rings with high sliding ease and very high mechanical resistance, in chromium-plated S10 spheroidal cast-iron.
1st scraper - ring in chromium-plated S10 spheroidal cast iron.
2nd three - piece scraper ring made of chromium-plated steel alloy.

Fits Kymco 50cc 4 Stroke

Chinese 50cc 4 Stroke

  • Model: 100-3113243