125-150cc Big Bore Kit, Andretti Baja Benelli Keeway Strada Vento Yamati, GY6 QJ

Description

ITEM DESCRIPTION:
150cc Cylinder Kit with 57.4mm bore, 15mm wrist pin & 54mm stud spacing for the GY6 variation known as the "QJ"
Engine stamped Q
J157QMJ or QJ158QMJ. See below for more info. This cylinder will not interchange with a standard GY6 engine or other GY6 variations.
Partial List of Makes & Models that use this engine:
Andretti
Baja
Benelli
Keeway: ARN125, Genric 125, GT F-ACT 125, F-act 125, Matrix 125, RY8 125, RX9 LEONE
Strada
Vento
Yamati
NOTE:
This can be used as replacement for a 150cc QJ engine or a big bore kit for the 125cc QJ engine, however, if you're installing this one a 125cc engine you'll 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:
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. The 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 this cylinder is not interchangeable with any other GY6 variation.
(The Cylinder 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.
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.
7) "P" Engine (1P57QMJ)  This engine uses a 73mm tall head with 4 valve cover bolts. The cylinder uses 54mm stud spacing and will interchange with the standard GY6 engine. One of my customers reported that his case opening was only 62.3mm which means he had to bore the cases to accept a 61mm big bore kit (no way to know if they are all like this).
8) KL30F 150cc Kymco engine, used on Agility and maybe other Kymco models. I have very little info on this motor but I believe the cylinder has a different stud spacing to prevent interchange. If I can get more info I'll provide an update.
NOTE:
I literally spent days gathering this info. There is a never ending flow of contradicting info floating around the internet so I cannot guarantee this info but it is true to the best of my knowledge. If you have additional info you can provide I'll be grateful if you share it with me.
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