Honda rs nf4 109mm rod.

Sujet: Honda rs nf4 109mm rod. 29/3/2020, 21:24

I have a proyect on a Honda rs 125 nf4 with a nx4 95' barrel

The proyect is that I want to change the rod from 104mm to 109mm with a 24mm piston height instead of 29mm.

I saw a italkit kit of long rod a short piston (similar than aprilia rsw piston). The piston is 143gr with ring and pin.

What do you guys think about it?

Thanks

Sujet: Re: Honda rs nf4 109mm rod. 3/4/2020, 12:56

Hello
If you do this, you will need a new cylinder head,
because the "alt. height" of nf4 piston is 2.5mm instead of 2.0mm for aprilia gp piston,
so no good squish band angle.

I have asked me the same question with a rotax 122 engine, but not enough money to realize it…

Good luck

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