Airsal 50mm Big Bore Cylinder Kit for QMB139 50cc

Airsal 50mm Big Bore Cylinder Kit for Kymco Agility 50 and QMB139 50cc Engines. Kit includes cylinder, piston, rings, piston pin, cir clips, and gaskets. Aluminum cylinder construction for better heat dissipation.

When used in conjunction with a stock crankshaft the total displacement comes out to 81.3cc! Your stock head can be reused. High compression piston included! .5mm taller than most standard 50mm big bore kits.

*You may need to modify your engine case to accommodate the larger cylinder. Not compatible with Sym Symply 2. On some Chinese QMB139 engines, the cam holes may need to be enlarged.

Please see our Warranty & Returns Policy.

• Upgrades to 81.3cc
• Cylinder Bore: 50mm
• Cylinder Sleeve Outer Diameter: 54mm
• Compression Height of Piston: 20mm
• Cam Hole Diameter: 6.5mm

Important Parts Notice: Not all replacement or upgrade parts come with instructions. It is the customer's responsibility to have common knowledge of the installation or hire an experienced installer. We are not responsible for any damage that may be caused by any of the items we sell, whether installed by you or a professional. We are not required to provide step-by-step instructions or technical support. In any case, we will always do our best to help you with any technical question you may have. Electrical parts are non returnable and the buyer assumes all risks.

Copyright © 2017 A to Z Parts Inc. All rights reserved.