Jeff The Drunk wrote:
On Tue, 13 Apr 2010 08:00:02 -0700 (PDT), hibb
wrote:

I promised when I got this fixed I would post the results.

Last fall, I was having trouble with my lawn tractor and posted about
it. The tractor would run for about a half hour and then just stop. It
would have to sit for two or three hours before it would start again.
This machine has a 15 hp Kohler engine in it.

I got through the last few mowings last year without ever getting it
fixed but when I went to mow for the first time this year it didn't
want to start but finally did. It ran for about 20 minutes and quit. I
let it sit all night and tried to start it the next day and it would
not start at all.

But this year when I pulled the cover off of the engine I noticed the
likely problem right away. It was the magneto or what we used to call
the coil. I don't know how I over looked that last year. It has been a
while since I have had to work on an engine. I replaced the spark plug
but completely ignored the thing the spark plug wire ran to.

Oh well, it's fixed now at least.

David

Ok how did you determine the mag was bad?

because that's all it could have been if losing spark.