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Watch you plug color! Do plug chops on the regular till you dial it in! Every big bore Zuma we build (friend and I love these things) we get a minimum 55mph with the stock airbox. Well, we run a gear up in the reduction box also-15/50 ratio. Anyways, my friend runs a rear facing pod filter and he had the worst time getting the jetting correct. Then, we got caught in the rain so he has the rain approved slip on cover over it now. They also make a over-sized factory direct replacement airbox. Oversea's and Mexico get the 100cc 2 stroke bug-eye Zumas, thats one of the only performance related things that directly transfer over, the airbox. I did a Stage 1 build on my pre-bug. Hit 45mph but didnt like the exhaust. If you get a expansion chamber type exhaust, the Yasuni R is a great value-both with a 50cc and 70cc. The "Z" series sucks. I bought a Z series...... Had a R series Yasuni on my old 70cc 2008 bug-eye Zuma. Worked great and not to loud either.
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