Any advice for gearing 2003 cr125

I am wanting more low end power and am wondering what gearing I need.

its said that 13-53 is the best but i find good my 13-51,

its said that 13-53 is the best but i find good my 13-51,

 

Get your cylinder ported for Low/Mid.  Best and least expensive enhancement.

What do they do when porting? Polishing the transfers? I have never done that

What do they do when porting? Polishing the transfers? I have never done that

 

I've never done it either.  Leave it to a professional engine tuner.  Its precision grinding and polishing, and epoxy.

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