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what is the best size jet size to improve speed for s piaggio zip 4 stroke ?

I'm trying to increase the speed of my piggio zip 4 stroke 0 8 . What size jet does it need.
kelvin, September 2013
Kelvin, the main jet i guess you're talking about, the size you already have in the bike will be the most efficient in terms of correct fuel mixture at higher revs for max top speed.

perry, October 2013
link Click here to see other fixes for Piaggio Zip.