Nikki carburetor 2019 Kawasaki Mule SX KAF400

[MParr]

This Mule has always run rich and carbon fouls plugs. It’s getting to where it will need rebuilding or replacing. Is there a replacement Walbro carburetor available for this Mule?

 

[StarTech]

Might be simpler to rebuild the carburetor and install a leaner jet.

You have a choice of 99, 102, 105, and 109 that leaner than the 112 that supposedly was factory jet.

Or order a new carburetor and leaner jet.

Might be trial and error on which one to use.

 

[MParr]

Might be simpler to rebuild the carburetor and install a leaner jet.

You have a choice of 99, 102, 105, and 109 that leaner than the 112 that supposedly was factory jet.

Or order a new carburetor and leaner jet.

Might be trial and error on which one to use.

That’s what I was thinking. I’m going to try a few more things in the morning. I’m going to recheck the choke cable adjustment. I’m going to pull the cover off of the mixture screw and see if I can fine tune it. If that fails, I will put a rebuild kit in it and smaller jet. I was hoping there was a Walbro replacement.
Thanks.

 

[MParr]

@StarTech
I think that I’ll order a #109 and #105.

 

[Scrubcadet10]

put a BPR4ES spark plug in it. I've worked on several 600 series mules that fouled plugs, went up to BPR4ES from the stockc 6ES and that usuallys fixes them.

 

[slomo]

What is the jet size for high altitudes? I see no mention for an HA main jet.

Make sure the needle/seat holds at 7psi.

Carb float level?

How bad is the fouling? Pictures please.

 

[StarTech]

Jet for high altitude get smaller as altitude is increased. Note jet sizes are in hundredth of a millimeter. And they are usually marked.

 

[MParr]

put a BPR4ES spark plug in it. I've worked on several 600 series mules that fouled plugs, went up to BPR4ES from the stockc 6ES and that usuallys fixes them.

I already have. It hasn’t helped.
I currently have Champion RN14YC in it.
I thought of putting a BPR2ES in it.
The carbon fouling/rich condition seems to be fairly common in these Kawasaki Mule SX KAF400.

 

[MParr]

View attachment 69765
Jet for high altitude get smaller as altitude is increased. Note jet sizes are in hundredth of a millimeter. And they are usually marked.

Right, the #112 is the stock jet.
However, the Kawasaki FJ400D engine lists a #110 as the stock jet.

 

[MParr]

What is the jet size for high altitudes? I see no mention for an HA main jet.

Make sure the needle/seat holds at 7psi.

Carb float level?

How bad is the fouling? Pictures please.

Pretty bad. It’s done it for a while now. I’m going to tweak it a little and adjust the choke cable as described in the service manual.
If that doesn’t work, I will order the jets, gaskets, and a new needle. I may order a new float too.