With High toughness,corrosion resistance,rustproof and durable. .

Most of the time, engine cases must be cut.

2 with cylinder head for GY6, 139QMB, Kymco 50 2V With the latest V.

. 99 150cc Scooter Variator Tuning Kit. QMB139 Naraku High-Performance Parts - 90cc Cylinder Kit Naraku V.

Description: High-Quality Naraku Cast-Iron Cylinder 52.

4mm 94. 52mm performance big bore cylinder kit by ncy for 50cc or larger qmb139 engines 50cc qmb139 4-stroke 52mm, racing big bore cylinder set. Regular price $24.

Fit Model:Replacement for GY6 4stroke 49cc 50cc 100cc Engine,maximum upgrade kit for GY6 50cc 139qmb engine. ETA 45 - 60 Days.

$ 140.

Replacement Performance Big Bore Kit Cylinder Head.

ncy big bore cylinder kit (52mm bore, 88cc) for qmb139 50cc engines. .

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For GY6 50CC 100CC 1P39QMB 139QMB Big Bore Kit Cylinder Piston Gasket Set 50mm.
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class=" fc-falcon">QMB139 Naraku High-Performance Parts - 90cc Cylinder Kit Naraku V.

How to Install 139QMB / 1P39QMB big bore installation 50cc/70cc/80cc/90cc/100cc Install Part 2=====Follow this short link to see low cost GY.

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or Best Offer.

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From $99.

This 80cc big bore kit will fit the models below - Any machine with a QMB139 / 139QMB / GY6 50 (4-stoke) engines.

It’s recommended to get the complete 47mm big bore kit (Part# 1100-1439) in order to take full advantage of the bigger piston valve notch.


The cylinder bore is 52.