NCY 171cc Big Bore Kit - 61mm | No Case-Cut for GY6 QMB139 and other QMJ/QMK/QMI variants SYM

and other QMJ/QMK/QMI variants SYM / Lance Fiddle II 125/150

NCY performance parts are made in Taiwan

or QMK engine codes

Chicago Scooter Company go Chicago Scooter Company go MAX  Chicago Scooter Company Pug50

139QMB-based 50cc / 80cc engines with the following engine codes:

NCY 171cc Big Bore Kit - 61mm | No Case-Cut for GY6 QMB139 and other QMJ/QMK/QMI variants SYMNCY 171cc Big Bore Kit (61mm) No Case Cut for GY6 150 The NCY 61mm Cylinder Kit is the only 171cc upgrade available in the U. S., designed to fit without machining your engine cases. Featuring a specialized 62. 9mm outer skirt, this aluminum cylinder drops directly into standard GY6 150cc blocks. It is the ultimate "weekend project" for riders demanding a massive jump in torque and acceleration without the need for professional machine shop services.