From various sources, all concur ...
JL, no idea, maybe manufacturer. 1= 1 cyl. P= tall head 57 = bore dia.
The F is odd, all sources, but most of them are several years old, always say Q = GY6 and MJ = 150cc.
What does the engine look like? maybe with some of the newer internal reverse and some of the more oddball mounting configurations that have been made over the past few years, there may be a new designation for some of them, because the cases are so much different at the back end.
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