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Question: What does 1P39FMB stand for?

lifan clone

This number referres by some as the Honda "Monkey" engine, and is a clone of its original model.

1p39fmb = 49cc
1p47fmf = 70cc
1p47fmf = 90cc
1p50fmg = 100cc
1p52fmh = 110cc

There seems to be a correlation between the engine number and the bore size

39mm bore is a 49cc
47mm bore is a 72cc
52mm bore is a 110cc


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