My LA100 has low hours but recently started surging when the choke is in idle.

Jordan

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  • / My LA100 has low hours but recently started surging when the choke is in idle.
When I start the mower by choking it it will run fine for maybe 5 secs and then it will sound like it's flooding and getting ready to stall so I'll back the choke back down to the "run" area right in the middle. At that point it will start to rev up and down or "surge".

I can find a sweet spot halfway between fully choked and run where it'll idle more or less consistently but at a higher RPM than normal. I can even mow my whole yard with it like this and I have a few times but I'm wanting to see if I can fix the issue now rather than dealing with it. I've recently change the plug and fuel filter but no change.

Any ideas?
 

BlazNT

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  • / My LA100 has low hours but recently started surging when the choke is in idle.
Dirty carb.
 

bertsmobile1

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  • / My LA100 has low hours but recently started surging when the choke is in idle.
Water in float bowl
partially blocked main jet.

post the engine type and the complete set of numbers on the id tag.
 

wfrpalm

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  • / My LA100 has low hours but recently started surging when the choke is in idle.
Drain the float bowl to get any water out and run some Seafoam through it and see if that cleans the gunk inside the carb.
 

reynoldston

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  • / My LA100 has low hours but recently started surging when the choke is in idle.
Carburetor problem, surging is something wrong in the low speed circuit of the carburetor.
 

PJ

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  • / My LA100 has low hours but recently started surging when the choke is in idle.
When I start the mower by choking it it will run fine for maybe 5 secs and then it will sound like it's flooding and getting ready to stall so I'll back the choke back down to the "run" area right in the middle. At that point it will start to rev up and down or "surge". I can find a sweet spot halfway between fully choked and run where it'll idle more or less consistently but at a higher RPM than normal. I can even mow my whole yard with it like this and I have a few times but I'm wanting to see if I can fix the issue now rather than dealing with it. I've recently change the plug and fuel filter but no change. Any ideas?

To me it sounds like a dirty carburetor main or idle jets could be wrong bur worth checking

Warm regards

PJ
 
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