Predator 212 Carb Jet Help

MrGentry

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I have a Predator 212 with an air filter and header. Everything else is stock. The air filter kit came with a .038 jet, but it seems rich based on the plug and it backfiring through the exhaust. I plan to use the kart for off road driving mostly. Should I stick with the stock jet or go down to a .035-.037? Will changing the emulsion tube do anything?
 
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