You could just add some fire to the combustion with the MC250(MX) CDI. The p/b isn't altered, but it is amplified. There'd be more available on both ends of the rpm range as well.
Personally, I found on trail tuned bikes, this trumps a lot of tinkering($/time) about.
That being said. Head mods are the best $ spent and it's the right thing to do.
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