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Discussion Starter · #1 ·
Can anyone recommend a main jet size for a 97 zx11 that is stock except for a 4 into 1 muzzy exhaust?

Thanks in advance,

Eric
 

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Hard to say as every bike can react differently. Yours have 2 x 160 MJ (cyl. #1 & #4) and 2 x 158 MJ (cyl #2 & #3). Going one step would mean you need to buy 2 x 162 MJ (for cyl. #1 & #4) while you install your actual 160 MJ in carbs #2 & #3. This could be a starting point but you need to fine tune your ride.

Also, stock needles will possibly be too lean and even beyond what shimming them could provide.

If you get a jet kit, better to use Factory Pro's as they use the same MJ sizes than OEM Keihin and they do not require to drill the carb's slides.
 

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Discussion Starter · #3 ·
Thanks a lot Claude. I really wanted a good starting point, and you gave me that. I really appreciate the advice.

Eric
 
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