This has a displacement of 149.6cc (157QMJ) has a bore size of 57.4mm and a stroke of 57.8mm. The 152QMI (GY6-125) & 157QMJ (GY6-150) (QMI152 QMJ157) is a horizontal, single-cylinder, four stroke, forced air cooled engine.
These CDI's have no governor and eliminate that irritating rev-limiter which might be keeping your engine speed restricted What kind of engine is a honda qmj157? Engine applications include the 139QMB, 152QMI, 152QMJ, 157QMI, and 157QMJ. This is a 6-pin AC Racing Performance CDI with an Unrestricted Rev Limit and an advanced timing curve for the GY6 50cc 125cc and 150cc engines. This type-A Honda clone engine has a automatic CTV transmission. GY6 125cc 150cc (152QMI 157QMJ) Performance Parts The 152QMI (GY6-125) & 157QMJ (GY6-150) (QMI152 QMJ157) is a horizontal, single-cylinder, four stroke, forced air cooled engine. If you see ‘QMJ157’ then you’re looking at a GY6 150cc and chances are, we’ve got the parts you need to get it running again. You should see engraved letters and numbers. Look under the left side of the engine, directly over the kickstand.
