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Old 11-15-2022, 09:44 PM
 
48 posts, read 21,377 times
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defective spark plug? restrictied carburetor? Malfunctioning ignition coil?
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Old 11-16-2022, 08:07 AM
 
Location: Eastern Tennessee
3,915 posts, read 3,480,308 times
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Quote:
Originally Posted by hipastore View Post
defective spark plug? restrictied carburetor? Malfunctioning ignition coil?
Add plugged fuel filter and poor quality gas to the list. Also if it's a riding mower the switch under the seat.
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Old 11-16-2022, 08:16 AM
 
Location: Raleigh, NC
5,295 posts, read 6,040,017 times
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Originally Posted by hipastore View Post
restrictied carburetor?
Not sure what a restricted carb is, but a lot of time it is due to gas sitting for awhile in the carb. On my tiller, I added a gas shut-off valve. When I am done with it for the season, I turn the gas off and let it run dry. Always starts on first or second pull the next season.
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Old 11-16-2022, 08:21 AM
 
Location: East of Seattle since 1992, originally from SF Bay Area
40,512 posts, read 72,334,864 times
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Quote:
Originally Posted by don6170 View Post
Not sure what a restricted carb is, but a lot of time it is due to gas sitting for awhile in the carb. On my tiller, I added a gas shut-off valve. When I am done with it for the season, I turn the gas off and let it run dry. Always starts on first or second pull the next season.
Yes, this is definitely the most common problem. Often you can take off the air clear ad spray Gumout
carb cleaner, let it sit a while then prime it and it will start. You may have to remove the spark plug and put a few drops of gas directly into the head. If it starts then dies, do the Gumout again.

Another common problem is that some, especially with bigger engines, will have an oil level protection switch. If the oil is low it will shut off and not start until it's filled back up. People tend to forget about checking the oil level.
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Old 11-16-2022, 09:14 AM
 
Location: The Triad (NC)
32,959 posts, read 77,466,602 times
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Originally Posted by hipastore View Post
waht are the common reasons why lawn mowers fail to start?
Not being used enough and not being put away well after being used.
Like most repair issues it still comes down to housekeeping and basic maintenance.

Not being used enough means it sits idle unused a lot <-- not bad in itself, but ...
Not being put away well after being used leads to issues like dried out fuel line crud.

I mow mostly with a riding lawn tractor (and grass catcher for leaves in the fall).
The push behind only comes out of the shed ~3x a season for an hour or so of odd corner work.
I use an old tuna fish can to portion in a small amount of fuel on these days ...
and when I'm done I run the engine until the fuel is all used up.
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Old 11-16-2022, 09:22 AM
 
Location: Sunnybrook Farm
1,990 posts, read 834,066 times
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It's just like your old man told you:

Air
Fuel
Spark
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Old 11-16-2022, 09:24 AM
 
Location: Full Time: N.NJ Part Time: S.CA, ID, Coastal GA
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#1 reason small engines fail to start is bad gas IMO. Its been mentioned earlier in this thread, but its worth repeating. Start there.
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Old 11-16-2022, 11:32 AM
 
9 posts, read 4,239 times
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Gas not being drained from the carb is the number 1 reason small engines have problems.
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Old 11-16-2022, 11:32 AM
 
Location: Near the Coast SWCT
80,356 posts, read 68,422,417 times
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Quote:
Originally Posted by hipastore View Post
defective spark plug? restrictied carburetor? Malfunctioning ignition coil?
Yes to all. I had experience with all those being the reason and even include a blocked air filter.


I found this guy on YouTube recently and I enjoy his videos on lawnmowers. Might learn a couple things from him. TommyTime
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Old 11-16-2022, 07:20 PM
 
22,259 posts, read 65,546,228 times
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Common reasons? A hot sunny day and a recently purchased six pack. Interpersonal relationships. Lack of an available offspring and $10 to spare.

(You asked)
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