Suzuki ships their Z400's with a 130 main jet and the jets come in increments or .25.
And I ride at 5500 ft. elevation.
So my question is:
I took the quad out last weekend and you could defintely tell it was rich. It would backfire coming off the throttle. So I had the dealer look at it and he pulled the plug and it was black indeed. He went down 4 jet sizes to a 120. I took it out yesterday and man it had a butt load of power! I then took of the airbox because this normally works quite well and she started cutting out. Put the airbox lid back on and "Whala!" she was running fine again.
Do you think the dealer went to lean?
The plug looks more white than grey or tan, but my only experience woth plug color is on 2 stokes.


sanojoe

 

you are to lean if your plug has any light coloring to it. Go up 2 jet sizes

 

My mods
No Lid
No lid on snorkel
End cap off silencer
5000ft
145 main
I have an HMF slip on now and haven't changed the jetting and it's still dead on!

 

Hey man, what's up Sanojoe? You're going to have to rejet again if you want to run with the airbox lid off. Add a pipe while your at it. It really helps the Z400 a bunch, but now hits the rev limiter really fast.{gotta get the rev box as soon as it's available}

 

sandman, I could never run @ 145 main, man the plug was caked at a 130 main. I wouldn't think 1000 ft would make that much of a difference. Now if I had a HMF that may make since, but I don't yet.
sanojoe[img]i/expressions/face-icon-small-smile.gif[/img]