Exmark runs well for 30 min, then sputters - Lawn Mower Forums : Lawnmower Reviews, Repair, Pricing and Discussion Forum
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post #1 of 3 (permalink) Old 10-14-2019, 07:31 PM Thread Starter
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Exmark runs well for 30 min, then sputters

I've got a 2006 Exmark Lazer Z LHP with the Kawasaki FH580V AS29.

The mower will run well for thirty minutes and cuts well. After thirty minutes it starts to sputter, then if medium to heavy load is put on the engine it'll die. In other words, after that thirty minute interval, if I engage the blades, it dies; if I push the handles more than 25% forward, it dies. It'll go forward if I go really, really slow. It'll idle ok for a while, but eventually dies.

Here's what I've done for repairs:
- replaced with fresh gas, twice: once with ethanol free, once with high octane (at advice of a mechanic)
- cleaned carburetor and replaced gaskets
- replaced both ignition coils with OEM coils
- replaced both spark plugs, making sure gapped properly

I want to avoid taking the mower to a mechanic as I feel I can do most repairs on my own.

Any advice as to why the mower will run perfectly for 30 minutes then die?

Thanks!

JOE
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post #2 of 3 (permalink) Old 07-30-2020, 12:58 PM
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Sounds like a fuel problem to me.

Did you:

Replace fuel filter?
Replace fuel lines?
Rebuild carb or just spray it out?

Any one of those parts might be your problem.
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post #3 of 3 (permalink) Old 07-30-2020, 02:12 PM
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Gas cap vent plugged? Just had this problem on a friend's Personal Pace.
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