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Old 04-09-2010, 04:56 AM
Bikeguy Joe Bikeguy Joe is offline
Godfather of Motorized Bicycles
Join Date: Jan 2008
Location: up north now
Posts: 11,531
Default Re: Drilling the muffler+Air Cover Mods

The limits/sizes are set by how much noise you want to add, and your ability to read the spark plug and adjust your carb accordingly.

Then you may gain a 1/10 hp or so.
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