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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?

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.

StarTech said:

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.

Click to expand...

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.

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

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.

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.

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

Scrubcadet10 said:

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.

Click to expand...

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.

StarTech said:

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.

Click to expand...

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

slomo said:

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.

Click to expand...

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.