engine won't start !

[jacko]

[Meat Plow]

Oren wrote this I think.

Under compression whatever contaminants that are fouling the plug get pressed against the insulator and plug tip making a pathway for the spark to ground instead of across the tip. Having raced 2 stroke dirt bikes back in my 20's I've seen this many times. Anyway that's my theory FWIW.

[scorman]

Kudos to the team !

Got it running after letting it stay idle for two days ..AND guess what it was ?? the sparkplug!

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

[Oren]

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.

[Oren]

I read too much into _failing under compression_.

I have experienced a bad plug right out of the box...before pre-gapped plugs. There was no time for fouling as the plug was new. It had to be replaced immediately after install.

I prefer fouled plug term over failing. Just me:)

[Stormin Mormon]

Anytime, my friend. We are good at contributing to dilemas.

So, ether didn't do it?

[Meat Plow]

Well I have seen plugs that would provide the same intensity spark of a new plug perform poorly when installed. Keep in mind that I posted my theory on what happens and not something that was scientifically proven. Glad to see tho that the OP took your advice and changed the plug.

[Oren]

I only "contributed" to the OP "dilema.".

:))