single best thing to increase performance

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My favorite "stock" Puch set-up in the mountains so far is as follows:

-15 bing, 16 intake (bored 14)

-High compression head

-Clutch balanced and lightened to 92g

-Home-made V-stack, or Bing high flow filter

-14/45 gearing on 2.25 tires

-Proma GP pipe

It's not that fast top speed, mid 30's due to the gearing, but no hill stands in my way and i keep up with traffic. It's a bit flatter by you so can run taller gears and a lighter clutch no problem, on the same set-up but w/14/45 and 80g shoes I'm pulling 40 @ 5600'.

What made the most noticeable difference in speed, easily the gears; what made the most noticeable difference in power, the pipe; what made the biggest difference how they worked together, the clutch.

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