Engine code question - ATVConnection.com ATV Enthusiast Community

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Old 04-18-2017, 04:46 PM
Weekend Warrior
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Join Date: Feb 2015
Posts: 1
Default Engine code question

I looked at the sticky, but didn't quite find my answer. I am buy a 125cc engine with the stamp code, FH157FMI, on it. I know that the I represents 125cc..but the 57 should represent 57mm bore, which is 150cc. The engine is a Lifan style. Anybody else have this code? I plan to tear it down when I get it. Just wanted to know the size to order some parts. Thanks John
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Old 04-20-2017, 01:49 PM
Pro Rider
Join Date: Oct 2013
Location: Lancaster England
Posts: 1,903

Just looked it up.and you can get 56.5 bore x 48.8 stroke pit bike engines. My guess would be, so they can use the same engine for a 150 using a longer throw crank.
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