When you have everything for the engine to run but it doesn't, it is likely
caused by an obstructed exhaust. That can also cause gas to be blown back
out of the carburetor. It is pretty unlikely that your ignition system is
bad or off tim;ing, but the suggestion to try a new spark plug, even if the
present one is sparking, is valid.
It is pretty unlikely that your ignition system is
I had a guy come to do some concrete work. He had a nice mechanical trowel
with a Honda engine. After pouring the concrete, they couldn't get the
trowler to work. He gave up and started to trowel it by hand, which was
It had spark, it had gas. I poured a little in the intake. No luck.
I went and pulled a Honda plug from my mower, and it was a match. I put the
plug in, and it took off on the first pull. The guy was just about in tears
thanking me. The concrete came out okay.
Always keep a couple of extra plugs. You can mess with them and clean them
up with a pin in the recesses of the parts on a cold winter evening. But
when it's GOT to run, it's nice to have a quick replacement that you KNOW is
Kudos to the team !
Got it running after letting it stay idle for two days ..AND guess
what it was ??
Not to belabor the point, but this was a real fooler ..
the original plug still gives a great spark when grounding the
tip ...HOWEVER, when I tried same experiment with that plug on another
electric start snowblower ....NOTHING! ..couldn't just swap the plugs
because it was a diff plug, but a working lawnmower used the same
plug ..swapped that one and it gave a strong spark on the second
snowblower ...put lawnmower plug into the malfunctioning
snowblower ...and off it went
Thanks to all who contributed to my dilema.
BTW, years ago I had seen a garage tester for spark plugs that
connected to the air compressor with a pressure gage ...you could see
plugs that worked under atmospheric pressure, but at 120psi, some did
and some didn't ..so, this is NOT speculation, but a fact.
Stew Corman from sunny Endicott
Years ago there was a tool (in real gas stations with a two bay
service) for cleaning spark plugs, essentially a small sand blaster.
One connected the air line, inserted the plug into a rubber
collar/washer(?-) and with a few short blast by pressing the button.
Never saw a tester connected to compressor.
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