It is a Briggs
& Stratton, about 5 yrs old, and gets medium usage. It has given me no
problems until now.
CY: OK, so it's fairly recent.


The cylinder appears to be getting a fuel/oil mix delivered but is not
getting spark.
CY: So, it's two cycle?


CY: I may be mistaken, but I think now days the coil and ignition module
are
all part of the same assembly. So, if the ground wire isn't killing it,
and
the magnet is spinning past th e coil, you should get spark. If not, you
replace the coil and module assembly.

'Walking' lawnmower.

4-cycle? Not sure - I don't have to pre-mix oil and gas. (see more below.)

I replaced the coil/ignition assembly and now have spark back at the plug.
Unfortunately, it still won't start.

I have left the plug connected to the plug wire and grounded out the 'body'
of the plug and seen what appears to be consistent and good spark when
cranking the engine. There is fuel getting to the cylinder because I see it
on the plug when I pull it after cranking. I can't understand why I would
have two different failures at the same time. I am going to change my gas
out and see what happens. (I usually run the mower off of the same oil/gas
mix I run through the weedeater. One of the mechanics at a lawnmower shop
suggested it and said the mower engine would actually last longer for it.)

Q: Even though I see the plug sparking when I pull the start rope, can a
plug still be 'bad' and part of my problem? I think it is a Champion
RJ19LM. The manual sez that in some places (e.g., CA) the plugs will have a
resistor in them to reduce EMI emissions. If the place I am buying the plug
has any idea whether the plug has a resistor I will try to get the
non-resistor version.

My manual for my Ryobi line trimmer at least came with directions on how to
adjust the carburetor but this manual for the Murray mower / B&S engine
unfortunately doesn't have any such information. I'll start with a new plug
unless people here feel that mine is good.

Thanks.