Cylinder Kit, NCY 50mm Big Bore 80cc for 50cc 4-Stroke 139QMB Chinese Scooters

50mm NCY 80cc Big Bore Cylinder Kit for 50cc 4-Stroke Kymco, SYM, 139QMB Scooters

INCLUDES:

• Cylinder Block
• Piston
• Piston Rings
• Wrist Pin
• Circlips
• Gaskets

COMPATIBILITY:

• BMS – Apache 50 4T, Heritage 50 4T
• Diamo – Classic 50 4T
• Gilera – Capri 50 4T, Ciclone 50 4T
• Lance – Charming 50 4T, GTR 50 4T
• Roketa – Bahama 50 4T, Maui 50 4T, Sicily 50 4T
• Tank – Urban 50 4T, Sporty 50 4T, Viaggio 50 4T
• Many Other 50cc 139QMB Based Engines
• **This will not work on the QJ models

NCY GY6 50/QMB139 50mm bore Cast Iron Cylinder Kit w/o head. The perfect upgrade for most QMB139/GY6 50 scooters, this bolt-on 81cc kit will really give your scooter some go. It is recommended to get part number 1100-1239, 50mm big valve head as well, as most stock heads will not fit.

In addition, we really recommend 1100-1250, NCY Performance Camshaft as an amazing complimentary item to this kit. It will allow the kit to perform to its maximum potential and go 50-55 MPH!

Have a look at our Decompression Tube Assembly (1100-1282) which replaces your dipstick and allows excess crankcase pressure to be released. Good idea to install one of these alongside any cylinder kit upgrade.

**NOTE: Not legal for use in California on pollution controlled vehicles. Check local laws before installing.**

**MADE IN TAIWAN**

**NOTE: Electrical, High Performance, Aftermarket items are non-returnable so please check photos and specifications before ordering.

Please see our Warranty and Returns Policy