Question about Husqvarna Zero Turn Mower Z5426

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Husqvarna z5426 running rich and fouling plugs

My mower starts fine but after running for a few minutes, it seems as though something in the carbs isn't working properly and too much gas is being pumped in. I took out the plugs and noticed that one plug had been fouled up and I had just replaced them. When it starts to run rich it bogs down and tries to cut off.

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  • ransome1200 Jun 01, 2009

    Thanks Captain! I'm going to tackle it tomorrow.

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  • 15 Answers

Sounds like a fouled needle seat, or the float bowl is failing.

Start with:

Pulling your Carb, and cleaning it out. COMPLETELY.
A ton of people think "a shot of carb cleaner, and a gasket kit" is a carb fix. It is NOT, and WILL NOT fix a carb, if the problem isn't gaskets, and shots of cleaner!

Meaning, if she is running too rich, then too much fuel (as you said), and fouling plugs, remember there are only a VERY few things in the carb anyway as it is.

1. Needle Seat
2. Fuel Float Bowl
3. Butterflies
4. Fuel Ports
5. Air Ports
6. Gaskets/Diaphragms.

My advice: (This assumes you HAVE NOT ADJUSTED YOUR CARB OUT OF DEFAULT!)

Pull the carb (Carefully!) and tear it COMPLETELY down (Carefully!). Note where stuff went, take your time, be patient.

When you have everything but the butterfly plates out, run some Gum-Out through each and every port, after you made sure to pull the Float Bowl, and the Needle Valve (and remembered how they went back in there!). Take some compressed air, and follow through (CAREFULLY!) on each and every port. Clean the very TIP of the Needle Valve. Shake your plastic Float Bowl. Does it have liquid inside? She has a hole in her. REPLACE!

If not, then this exercise was cleaning crud/residue that is ALWAYS building up inside carbs in 2/4-stroke engines world wide, every day. NOW do a "carb gasket rebuild".

Note: Remember that sometimes, crud/junk is testy, and stubborn as a mule to get out. Double check any screens above/below your Needle Seat and Valve. Remember that Needle Valves come with solid tips, and some with rubber tips. Regardless, be careful, and clean thoroughly! A Needle Seat that isn't getting closed, is a Needle Valve that is letting WAY too much fuel in!

Posted on May 30, 2009

  • Captain Slap Jun 02, 2009

    Not a problem! I hope to hear back from you that you fixed 'er up!

    If not, I am sure we can whoop it! (Patience and Lawnmowers......they go hand in hand!)

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