Help! Gy6 157fm
 

Hey guys,
I am looking at getting a new engine for my go kart ( Jehm Powersports ATK-150R2 ) and I can't seem to be able to find the right engine ( complete ) anywhere!! The number says 157FM on the engine itself, and I know that it is a short case!! PLEASE someone help me out here!! I know that it is a 150cc GY6 engine, and it says 157FM on it ( no I am not stupid, It is that )

Bumpy

i seem to recall reading that the FM series engines are a bit of an oddball, but it's primarily internal dimension differences relating to the cylinder and head (bolt holes etc) . if you have your original engine, all you really need to do is match up a short case and output shaft length to what you have.

Any info on the ls157qmj

What could i use instead of it??