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Cr 125 engine mods

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What can I do to make my 2003 cr 125 go better. What are the best upgrades to put on a cr 125. And what's the mod to the power valve to make more power?

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Improving performance is very dependant on the current state of tune.

If not already done, the first and foremost thing you can do for best performance is refreshing absolutely everything, top to bottom.

Once that's done, before any external bolt on parts added or modded, simply fine-tuning the jetting to perfection.

Aside from porting (which should be done by someone experienced), a simple correction of the squish height often wakes up many 2-strokes at low-to-mid rpms.

 

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