SF Man wrote:
On Thu, 19 Aug 2010 19:50:07 -0400, Stormin Mormon wrote:

Make sure it's not a Champion brand plug. they had a run of defects.
I've bought Autolite, or NGK. If it fails to start, look at the spark
plug. Wet? Flooded.

Champion RCJ7Y. None of the stores carried that but they told me a Champion
CJ7Y (without the R) is the same thing so that's what I put in there.

The R means it has a series resistor for EMI suppression. Probably
does not make much difference either way.

The plug, when pulled out hot, is dry as a bone so I'm pretty sure flooding
isn't the culprit. I'm beginning to suspect either the plugged fuel filter
(I didn't know chain saws HAD a fuel filter) or the spark coils are bad.

Don't know how to test the coils though.

Turn the thing over with the plug removed from the engine, but sitting on
top of the engine to make good electrical contact. If you see a nice hot
spark, you have good magnetos. If you don't see a spark, your magneto or
points have an issue.

Magnetos don't fail very often, but it happens. Fuel systems clog all
the time, constantly.
--scott

--
"C'est un Nagra. C'est suisse, et tres, tres precis."