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I was wondering what size jets i souhld put in my Z400. i have a Big Gun Race full exhaust pipe, gettin a twin air filter soon, and want to run with the airbox lid off. what size main jets should i put, piolet jets, and will i need to adjust my needle? this information would be greatly appreciated. thanks to any onewho can help me out.
 

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Start with a 160 main, alba needle in th #4 position, 25 pilot, 3 turns out on the air screw.

But, better yet, have the work done by a reputable shop unless you're willing to learn and read plugs. Theres a lot to it, and more to jetting that just pipe and airbox mods. Temp, humidity, altitude... But the above should be a good start. Just learn how to read a plug and do plug chops.
 

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you can ship it to me and i'll do it for you.......
:

pm me if you need a hand, happy to help.
 

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jetting

I just jetted my carb and went with a 172.5 main, and a 30 pilot. I did not need to mess with the needle at all and my bike is kicking a##. I have a K&n filter with no lid and this set up is fine tuned. I live in Pa which is not far from you. Hope this info helps.
 
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