Blue Line Big Bore Kit w/ Head 4T (72cc, 64mm Valves); 139QMB

Blue Line Complete 72cc High-Performance Big Bore Cylinder Kit

This 47mm big bore kit works with most Chinese 50cc 4-stroke 139QMB engines.

Pump up that weak engine to a respectable 72cc displacement, on a budget. This kit is not intended to make your scoot a screaming race machine. It is intended to get you that extra power you need. (Most Chinese 50cc's only put down around 1.5hp to the ground.)

Increase the reliability & power of your scoot today!!

Specifications:

• 1 - Head Assembly with 64mm valves
• 1 - Iron Cylinder with 47mm bore
• 1 - Piston with Rings (Not Pictured)
• 1 - Wrist Pin 
• 2 - Circlips
• 2 - Exhaust studs
• 2 - Intake Studs
• 1 - Base Gasket
• 1 - Head Gasket

Compatibility:  Fits many 50cc Chinese Produced Scooters and ATVs with GY6 50cc / 139QMB 50cc equipped motors with engine codes below:

139QMA , 139QMB , 1P39QMB , 1P39QMA , 1P39QMA-2, YN139QMB, JJ1P39QMB, 139FMA-2, BD1P39QMB, BN139QMB, LJ139QMB and more.

*NOTE* Remove your valve from your scooter's head and measure the full length of the valve stem. Some scooters like Znen (Wolf Brand, GMW, Bintelli, etc), Kymco 50cc 4T(Agility), some newer TaoTao, and other 50cc 4-stroke scooters may have 69mm valve stem length. For these applications use part number 1100-1515.

About Blue Line: Blue Line provides OEM-equivalent replacement components for on-road scooters. Blue Line parts serve as direct-fit alternatives when original equipment manufacturer parts are poor quality, unavailable, or prohibitively priced. Since 2018, Blue Line has been delivering high-quality scooter parts at competitive prices, ensuring optimal value for customers.

This product is not intended for use on public roads or land.

Brands: Amstar, Amigo, Ascend, Baotian, Bashan, Blade, Boom, Chicago Scooter Company, Dongfang, Roketa, Baotian, Bashan, BMS, Cool Sports, E Ton, Fly Wing, Eagle, Fly, Italica, Riya, Ice Bear, Jackel, Jet Moto, JCL, Taotao, Peace, JM Star, Jonway, Kazuma, Keeway, KMD, Kymco, Lance, Lifan, Linhai, Loncin, Longbo, Fuxin, Jiajue, Tao Tao, Tao Motors, Trailmaster, Maxtrade, Meitien, Motofino, Motorino, NST, Panterra, Panther, Qlink, Yiben, Red Streak, Redcat, Roketa, Schwinn, Strada, SYM, Tank, Terminator ,Tomberlin, TNG, United Motors, Vento, Vitacci, Wildfire, Wolf, X-Treme, X-Pro, Yongfu, ZNEN, Zhongneng , Zhilong, Geely, Wangye, ZH and more Manufactured by: Taizhou Zhongneng Motorcycle Co.; Jiangsu Zhongneng Motorcycle Co.; Jiangsu Meijunte Technology Co.; Taizhou Qianxin Vehicle Co.; Ningbo Dongfang Lingyun Vehicle Made Co.; Taizhou Zhilong Technology Co.; Zhejiang Jiajue Motorcycle Manufacturing Co.; Zhejiang Gelly Ming Industrial Co.; Taizhou City Senglong Motorcycle Manufacture Co.; Jiangsu Sacin Motorcycle Co.; Jiangsu Linhai Power Machinery Group Co.; Zheijiang TaoTao Vehicles Co.; Zhejiang Senling Motorcycle Co.; Sanmen County Yongfu Machine Co; Taizhou Jiaojiang Zhiwei Motorcycle Manufacture Co.; Huzhou Daixi Zhenhua Technology Trade Co.; Taizhou Zhongneng Motorcycle Co.; Zhejiang Riya Motorcycle Co.; Ningbo Longjia Motorcycle Co.; Taizhou Zhongneng Motorcycle Co.; and more