150c Cylinder Kit, GY6 GY7 GY6B QJ Quingiang QJ157QMJ, Scooter ATV Trike Buggy

Description

ITEM DESCRIPTION:
150cc Cylinder Kit with 57.4mm bore, 15mm wrist pin & 54mm stud spacing. For the "QJ"
Engine (stamped Q
J157QMJ or QJ158QMJ). Notice the unusual "wavy" fin design. See below for more info.
NOTE:
This can be used as a big bore kit for the QJ153QMI engine, however, you will need to check your case opening to be sure it's at least 60.9mm diameter (if not, the cases will need to be bored out to accept the larger cylinder)
NOTE:
This engine is a newer version of the GY6 125cc & 150cc engine and most parts are not interchangeable.
NOTE:
There are at least 8 variations of the GY6 125 & 150cc engine: (likely more).
Please contact me if you're not sure which engine you have, I'll help to the best of my ability.
1) The standard GY6 125cc & 150cc (152QMI & 157QMJ) engine used on 95% of GY6 applications. Make sure you have straight fins and 54mm
stud spacing to be sure this is the kit you need. This engine can use up to a 61mm big bore kit.
2) "QJ" GY6 125cc & 150cc engines, stamped QJ152QMI, QJ157QMJ or QJ158QMJ) manufactured by the Quingiang Company. This head is taller than the standard GY6 head, the cylinder has wavy fins and the valve cover is held on with 2 bolts making it easy to spot.
NOTE:
there are other GY6 variations that look like this one but will not work (see below).
NOTE
: Even though the stud spacing is 54mm (same as the standard engine), the two small bolts will not line up so the cylinder and head are not interchangeable with the standard GY6 engine.
(The Head in this listing is for this engine).
3) Kazuma GY6: This variation is used only on Kazuma 150cc Falcon & Dingo ATVs and has engine stamp KZM157QMJ. This cylinder has wavy fins like # 2 but is unique to Kazuma.