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Mower won’t crank when hot
Posted on 7/31/22 at 2:08 pm
Posted on 7/31/22 at 2:08 pm
I’ve got a Craftsman mower with a B&S engine. It’s about 11 years old. Cranks on first pull every time I get it out. If I have to stop mowing, for some reason, and go to restart a now hot or warm engine, it won’t start. Once it cools off again, it’ll start again on first pull. What’s going on?
7
Posted on 7/31/22 at 3:08 pm to HonoraryCoonass
So when this happens on an old car with a carb, it usually means the gas is boiling in the carb. I don’t know enough about small engines but that’s the symptom in a large engine
Posted on 7/31/22 at 3:19 pm to HonoraryCoonass
Could be a bunch of things but let's start with fuel. Non ethanol would be ideal but by chance are you running any of that E15 in there?
Posted on 7/31/22 at 3:25 pm to HonoraryCoonass
Posted on 7/31/22 at 3:32 pm to DingleBarry
Vapor lock
Posted on 7/31/22 at 3:53 pm to BearCrocs
Exactly. Non-E no prob, E10 hit and miss, E15 jackpot.
Posted on 7/31/22 at 5:00 pm to HonoraryCoonass
Coil/Magneto what ever B&S calls them. The wires expand and contract due to hot/cold. Over time they start shorting out during hot cycle. Use a business card to gap a new one.
Posted on 7/31/22 at 6:22 pm to PoorOtis
quote:usually, in my experience
Coil
Posted on 7/31/22 at 6:58 pm to HonoraryCoonass
I would also guess ignition. When the electronics heat up they stop working.
Posted on 8/1/22 at 12:11 am to HonoraryCoonass
quote:
Once it cools off again, it’ll start again on first pull. What’s going on?
Auto-choke is your problem. The wax-pellet thermal device that operates your choke is sticking. Replacement kit is about $25.
Posted on 8/1/22 at 8:37 am to Clames
quote:
The wax-pellet thermal device
Is that the choke thermostat?…..looks like a 4” sword stuck in a stack of nickels behind the muffler?
Posted on 8/2/22 at 10:28 pm to HonoraryCoonass
Yup, they fail and cause the exact issue you are having. I had a Troy-bilt lawnmower that had the same issue, lived with it for two seasons until replacing that part.
Posted on 8/3/22 at 8:35 am to HonoraryCoonass
i have seen this happen with a B&S that had too much oil in it.
Posted on 8/6/22 at 10:57 am to Clames
quote:
Auto-choke is your problem. The wax-pellet thermal device that operates your choke is sticking. Replacement kit is about $25.
Clames, your diagnosis was spot-on. It was the choke thermostat. The new one, plus tax, was just a hair under $26. Thanks, buddy!
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