From my experience, these tweaks are often more frustrating than beneficial. Boosting jets and swapping needles (or using a different carb) makes a small difference, then as you've clearly mentioned, the exhaust and induction come into play. More tweaks occur then the bike doesn't idle right or hesitates at certain RPMs. Some folks will then swap camshafts, which shifts the whole equation again. It can end up feeling like an endless string of adjustments.
From my perspective, if you want a faster bike, get a faster bike. I'll leave my CA95 stock.
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