+1 on head work. Stock is way out of spec. Correct squish and combustion specs make jetting easier, improved fuel range and increased power. Reed spacer removal increases response and check the reeds for sure.
Stock pipe and a the volume chamber bolt-on makes a broader powerband starting way down.
For quick revs and more top end, an MC cdi or even an older rm125. Search it.
Oh yeah, the carb has to have the jet block modified in order to get the carb to work right. Ron Black is the man.
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