I hate to sound like a rookie, but my 2003 Z400 is the first of it's kind for me. My question is what all I have to pull off to get to the jets on my carb. I recently put a yoshi-full system on and would like to re-jet so I can run with my lid off. I can work on almost anything, I just don't have any experience on 4-strokes.....YET....Any help would be greatly appreciated.[img]i/expressions/face-icon-small-confused.gif[/img]

 

Best suggestion I have is to buy a service manual.The process of the jet and needle change is relatively simple.The service manual will show you what you need to know.Another suggestion is to buy a DYNOJET stage 1 & 2 kit;this will give you directions on jet sizes for your mods.

 

Cool...thanks bud, I appreciate it

 

MANDATORY... get one of those impact screw-driver things before you pull the bowl off to get to the main jet. Then replace the screws with hex-head bolts from the local hardware store.
The main jet is under the bowl, with the slash guard around it.
Air screw is under that rubber plug in front of the carb on the bottom.

 

if his bike came from calf ??? there will be a brass plug not rubber for the air screw. mine was the brass plug.

 

before you try and loosen the float bowl screws put the screwdriver in the screw and tap on the end of the screwdriver fairly hard, those screws strip easily and they are tight, I replaced mine with six mm allan heads