replying to Sherman, Marc Belanger wrote:
The lawn mower is probably losing spark. It will get good spark if it is cold,
but once hot, one of 3 things could be happening. First, the spark plug could be
filled with crud, and when it is cold, the crud has a lot of non conductive
grease in there. This will turn to a liquid when hot and become conductive
enough to short out the coil pack and kill the spark. I would replace it if it
looks like there is crud between the edge of the steel and the porcelain on the
inside of the spark plug. Look between the metal electrode and follow the
porcelain where you can't see it anymore.. Yeah, thats the place, either clean
it out and get the bl;ack stuff out, eliminating the short and it will probably
work again. if not, the spark plug wire may be cracked and work while cold, but
once it warms up, the break is separated enough not to work. Same thing with the
coil. Or, the coil could be hust loose. It needs a ground to work and if the
coil is loose, when cold it may be connected electrically then when it warms up
it may disconnect. The coil and spark plug wire are one piece on a tecumseh or
briggs and stratton and are less than 25 bucks normally. Get one, screw it on,
wire it and rreplace the spark plug. Then, check to be sure the shut off wire
isn't shorted to metal anywhere, it it is, the mower will still not start. tape
it or reconnect it correctly to fix. The coil is under the crankcase cover. Oh,
btw, the coil needs to be mounted the correct distance from the flywheel if you
never seen one before. Try to line up or mark the old one before loosening it.
Some coild only mount in one location so this may not matter.
Less than 1 chance in 10,000,000 of THAT being the problem. Spark
plugs and infewrnal combustion engines don't quite work that way.
Again you are picking at straws - with something perhaps in the
nieghborhood of a 1 in 5,000,000 chance.
Now you are gettind somewhere close to the realm of possibility - and
even probability. The coils have solid state components in them that
can fail from heat and vibration.
The FIRST thing to do is remove the shroud and blow all the chaff and
weed seeds out of the cooling fins to make sure the engine is
cooling..Re assemble the engine - run it 'till it quits, pull the plug
wire and hold the end of the wire while someone gives the rope a quick
pull. If your eyes don't light up, you KNOW it is a spark problem.
Generally, if the coil is loose it will hit the flywheel and it is
more likely to have a problem starting cold than hot.
Why not check that first, and quite possibly save yourself 25
And in many cases (all older tecumsehs ) under the flywheel too.
On a Briggs (external mounted coil) a peice of cigarette package
cardboard or a business card is "close enough for government work".
replying to Sherman, mowerboy wrote:
My mower was doing the same thing but I fixed it it turned out to be my control
cable it was just unnoticeable loose from years of fair wear and tear a new
cable fixed my instantly
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