1p52fmi big bore upgrade - engine case bore?

Empana · Aug 19, 2023

Hello everyone!, I'm new to the forum

I have a 1P52FMI 125cc engine and I'm looking to do a big bore kit from aliexpress it should work but I dont know if I will have to bore the engine case.
Does someone know whats the diameter for the cylinder in the engine case of these lifan engines?

Thanks!

tmas · Aug 19, 2023

I think case boring depends on the size of the big bore kit you are getting. There are so many Chinese brands/models that you absolutely need to know your bore and stroke and piston pin size.
tmas

Empana · Aug 19, 2023

Yeah there are so many, but I thought that all 1P52FMI engines are the same, so with it's case diameter I would know what big bore kit to get...

Thanks for your response anyways!

dirtbkr188 · Aug 20, 2023

Empana said:
I thought that all 1P52FMI engines are the same

That isn't the case, the Chinese engine manufacturers take great liberties with their engine numbering systems, that is why tmas stated that the bore and stroke of the engine needs to be known before buying the big bore kit.

1p52fmi big bore upgrade - engine case bore?

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