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ideal combo upgrade (carb + big bore + cam)
Trying to decide what will be the best combo upgrade for these different big bore options.
61mm, 62mm, 63mm
Safe to go with a 30mm carb for all three?
A9 cam?
Wouldn't hurt to top it off with a 4 valve head?
Plan on doing the upgrade on a 150cc gy6 scooter.
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