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Started By
Message
Push lawn mower "burning" through spark plugs?
Posted on 4/8/14 at 8:51 am
Posted on 4/8/14 at 8:51 am
My lawn mower is burning through spark plugs, and by burning through, I mean within 20 minutes of putting a new one in, it is all black and the lawn mower want fire/start anymore.
I changed my oil at the end of last summer, so the oil shouldn't be bad. Did I put too much or too little oil?
I know nothing about engines except the basics, so talk to me like I'm 8.
I changed my oil at the end of last summer, so the oil shouldn't be bad. Did I put too much or too little oil?
I know nothing about engines except the basics, so talk to me like I'm 8.
2
Posted on 4/8/14 at 8:58 am to TexasTiger01
when I replaced the spark plug, it immediately ran fine until the spark plug got all burned up again
Posted on 4/8/14 at 9:03 am to Salmon
quote:
when I replaced the spark plug, it immediately ran fine until the spark plug got all burned up again
It's very uncommon for a small engine to not run because of a spark plug. Hell, I've even ran them on an ol plug out of my truck. If it were me, I would run it until it started acting up, then immediately conduct a spark test to see if it was sparking. A "burnt/bad plug" will not stop it from sparking.
Posted on 4/8/14 at 9:08 am to TexasTiger01
what will cause it from not sparking?
Posted on 4/8/14 at 9:15 am to Salmon
Does is smoke?
Posted on 4/8/14 at 9:18 am to Salmon
quote:
what will cause it from not sparking?
carbon build up on the plug
sounds like a carb issue
Posted on 4/8/14 at 9:21 am to Salmon
Ok, let's get back to basics.
Brand, size, and year of engine?
Got a pic?
What did it do when it started running badly?
Brand, size, and year of engine?
Got a pic?
What did it do when it started running badly?
Posted on 4/8/14 at 9:28 am to Salmon
And what do you mean by burning up? Just carbon buildup on the tip, or is the electrode completely gone?
Posted on 4/8/14 at 9:44 am to TexasTiger01
quote:
Brand, size, and year of engine?
Honda 4 stroke about 3 years old
quote:
What did it do when it started running badly?
sounded like it was dying but never would
and yes, it is carbon build up on the tip
that is what I meant by "burned through"
it happened within 20 minutes of me putting a brand new spark plug in this weekend
This post was edited on 4/8/14 at 9:45 am
Posted on 4/8/14 at 9:49 am to Salmon
OK, the best way to get to the problem is to try and duplicate it, then diagnose. This is a process you COULD take.
-Run it until it acts up.
-Pull spark plug and check for good spark.
If it were me, I would pull the carb and clean it, becuase 99.999999% of the time, this is the problem. The fact that you have little engine knowledge makes me believe this is probably your problem.
-Run it until it acts up.
-Pull spark plug and check for good spark.
If it were me, I would pull the carb and clean it, becuase 99.999999% of the time, this is the problem. The fact that you have little engine knowledge makes me believe this is probably your problem.
Posted on 4/8/14 at 9:51 am to Salmon
Kind of sounds like you overfilled the oil, but does it smoke a bunch?
Posted on 4/8/14 at 10:03 am to Hammertime
just when I start it
Posted on 4/8/14 at 10:10 am to Salmon
Seafoam
/thread
/thread
Posted on 4/8/14 at 10:14 am to Propagandalf
Posted on 4/8/14 at 10:46 am to Salmon
sounds like the carb is running rich, may have a stuck float or the adjustment screw has worked itself out a little
Posted on 4/8/14 at 10:50 am to TexasTiger01
Kinda sounds like a lack of maintenance to me. Before he resorts to pulling the carb. he should first reclean the plug and replace the air filter. If the electrode is black and oily it's running to rich and most likely due to fouled air filter. Do the simple things first.
Posted on 4/8/14 at 11:05 am to Salmon
Checking the oil level and replacing the filter are easy. Clean that plug on a bench grinder. If those don't work, taking apart the carb is an option
Posted on 4/8/14 at 11:10 am to Hammertime
last summer when it started acting up I changed the oil and cleaned the filter
didn't help
then I changed the spark plug and it ran fine for awhile, but just started acting up again
changed the spark plug again, and this time it carbed up in 20 minutes
didn't help
then I changed the spark plug and it ran fine for awhile, but just started acting up again
changed the spark plug again, and this time it carbed up in 20 minutes
Posted on 4/8/14 at 11:11 am to 4X4DEMON
quote:
sounds like the carb is running rich
IME on small engines, 99% of the time it is a problem with the carb. That much residue on the plug in 20 mins is def a problem with the air/ fuel mix.
I would just go to a repair shop and get a new carb, they are relatively cheap, I replace mine about every 3 years, they dont seem to last much longer than that.
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