Thinking about upgrading my air filter, 1977mopeds suggest to upjet when doing this. My jet is a 51 right now, what should I go up to?

Re: Upjetting?

most people say 1-2 jet sizes higher. i would start with a 55 then work down but i have never done this before

Re: Upjetting?

If you have a biturbo or another pipe you can probably upjet to around a 57-58..

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