On Mon, 07 Dec 2009 11:36:27 -0600, Red Green wrote:
From the images it looks like that plug's so mashed it was totally
shorted. If that's from piston contact I'd expect it failed on the first
hit - so if the others were all like that too the engine wouldn't be
running at all. 'course someone might have replaced just some of the plugs
with the wrong ones...
The other possibility is that someone was doing intake / carb work and
managed to drop a small nut/screw/bolt into the intake which eventually
ended up in the cylinder and bounced around; that could have made a bit of
a mess of the bore too, I suppose...
If they were all the wrong heat range plug they all would have suffered
the same fate since all of the clearances are the same. You should be
able to verify if it was the plug by getting the part number and looking
up the specs.
Excellent photos, and thank you for sharing. I had one, not
that bad, in 1991 on my trip from western NYS, to Utah. Had
to pull the spark plug while under a bridge in Wyoming. Very
obviously, I had plugs too long for the engine design. Oh,
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