NCY 171cc Big Bore Kit - 61mm | No Case-Cut for GY6 GO MAX REAR WHEEL ASSY Fits 157QMJ-based 150cc engines with

Fits 157QMJ-based 150cc engines with the following codes:

NOTE: This is essentially the 12mm wrist pin version of our popular PRCK1 kit

Includes Pick-Up Coil

a charging circuit

NCY 171cc Big Bore Kit - 61mm | No Case-Cut for GY6 GO MAX REAR WHEEL ASSY Fits 157QMJ-based 150cc engines withNCY 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.