Crankshaft GY6 125cc 150cc QJ QJ152QMI QJ157QMJ Quingiang Chinese Scooter ATV

Description

ITEM DESCRIPTION:
Quality Jinlang brand Crankshaft for 125cc & 150cc QJ
engines stamped QJ152QMI,  QJ157QMJ or QJ158QMJ) manufactured by the Quingiang Company
. May also fit other GY6 variations such as
GY6B or GY7 (
See below for more info). This crank will not fit a standard GY6 engine.
Specifications:
Threads: 12mm
Thread Length: 14mm
Wrist pin inner diameter: 15mm
Overall Length: 286mm
Number of Splines: 19
Number of Gear: 17T (both side)
Main Bearings: Flywheel side 56mm / Clutch side
62mm
(Included)
NOTE:
The overall length of this crank is different than the standard GY6 crank but the main difference is the clutch side bearing which is 62mm instead of 56mm. This crank is used on the QJ engine but may also be used on other GY6 variations. Carefully check all dimensions to be sure this is the correct crank for your engine.
NOTE:
There are at least 8 variations of the GY6 125 & 150cc engine (see below).
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 wavey 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 this cylinder is not interchangeable with the standard GY6 engine.
(The Crank 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.
4)
BN157QMJ, often referred to as
GY6-B or GY7, this is a Scooter engine made by BenNeng of the Zhongneng Industry Group and uses a taller head with longer valves and a 4 bolt valve cover. Cylinder has wavy fins like # 2 but is not the same. Often used on applications with 16" rear wheels but also used with smaller wheels on some applications.
5) GY6-B ATV engine stamped with the same ID # as the standard GY6 engine making this one confusing. Has reverse for use exclusively for ATV, Buggy, and Go-Cart's. The cylinder also has wavy fins like #2 but the studs are spaced 56mm apart compared to 54mm for standard GY6 engines. The head is 73mm tall head with 2 valve cover bolts making it look like #2 but the cylinder and head exclusive to this engine and almost impossible to find.
(This Crank may fit this engine).
6) 161QMK factory 170cc engine with 57mm stud spacing, straight cylinder fins and a tall 73mm head with 2 bolt valve cover. Used on ATV UTV with reverse and also for scooters (without reverse of course). The 57mm stud spacing allows for big bore kits up to 232cc although I believe other mods are needed to go to 232cc. I believe you can go to 200cc without any mods. The cylinder looks like a standard GY6 except for the stud spacing and bore size.