Jetting driving me nuts!

[Iasco]

So I have researched and tried pretty much everything I know

2001 warrior

My idle is too rich with a 45 and too lean with a 42.5..
Im starting to think the 45 isnt the right jet. The 45 has holes down the side and the 42.5 just has 1 hole in the middle and the threads are different on the 45.

No matter how much I lean or richen the idle screw with the 42.5 it gets the 'hiccups' and wont stay running while idling.
No matter how lean I make the 45 it turns my plugs black VERY VERY fast.
Checked the boot, nothing is cracked.
Carb has been cleaned and recleaned, nothing is wrong with it that I can tell, it just idle's way too rich with the 45, and too lean to run with the 42.5

Main jet is a 140 btw, but idling is the main issue.

K&N Lid cut off box
FMF Powerbomb and Quiet pipe 4

 

[Lbswut]

To my knowledge, the pilot jet should have 4 holes down the side. So you may need a 42.5 with the holes down the side and that might fix your problem.

 

[Iasco]

I cant find any pictures of what jets are 'supposed' to look like, anyone got any?

 

[Lbswut]

I do not have a picture, but where did you buy your jets? Most of us around here use www.jetsrus.com to buy jets. I would get an actual mikuni 42.5 pilot if the one you have is not that.

 

[Iasco]

the 42.5 is what came stock with the bike, and it worked great until I cut the airbox lid off basically

 

[Lbswut]

With no lid and a pipe the 45 should definitely work for you without running too rich. I see you mentioned the idle screw, were you talking about the actual idle screw, or the mix ratio screw? The screw you should be messing with is not the one that you can turn with your fingers. The one you want is on the underside of the float bowl. http://farm7.staticflickr.com/6225/6404922959_bbef6f2971.jpg The screw furthest to the right in that picture.

 

[Iasco]

yeah it's the air screw. As lean as it will go and its still rich.

 

[Lbswut]

You've got me stumped man. Sorry I wasn't more help. Maybe someone else around here has a better idea.

 

[Iasco]

You've got me stumped man. Sorry I wasn't more help. Maybe someone else around here has a better idea.

all good man, thanks