Year old walk behind self-propelled. Sometimes it won't start, other
times it starts and runs for about 10-15 minutes and stops. Even if
starts, when I turn it off to get drink of water or other reason, it
won't start again for an hour or two.
It just doesn't catch when it won't start at all. No sputtering,
etc. However, when it does start, when it stops on its own, there is
usually a faltering and then it stops. Almost like a vapor lock. Any
ideas of what is happening and how I can fix it?
It is new gas (actually less than a week) and the can I am getting
it from was bought new for this season so I doubt problems with that. I
cleaned the foam air cleaner after every use because parts of my lawn
are fairly dusty.
People thought cybersex was a safe alternative,
until patients started presenting with sexually
I was thinking either an ignition coil / magneto that is affected by heat.
Or, inadequate valve clearance. I've also heard that cheap grade of motor
oil can cause similar problems.
Christopher A. Young
Learn more about Jesus
My guess is a heat-related magneto.
A few times I had that issue it was electrical as in ignition module
or coil , start with a new plug and check plug wire, to me the fact
when you turn it off it won't start again shows it could be the module
as it gets hotter after its shut off, that would be a time to remove
the plug , ground it and have someone pull the mower to see if you get
a good spark. Or spray gas into the carb to see if it's fuel related
If the tank and carb were not run completely dry before winter
then it is likely fuel related. Try some Sea Foam in your fuel.
It isn't all that unusual for a gas engine to not fire after being
recently shut off unless it is left to idle down for a couple minutes
(due to fuel in the cylinder). My RX8 must be warmed to
operating temperature before being shut off or it's a tow to
It isn't very likely at all that you'd have any sort of electrical
failure on a mower that new.
The inferior gas/ethanol tends to build up a yellow gunk
inside carbs if not thoroughly emptied over the winter season.
All it takes is a small piece to break loose and give problems.
Sea Foam does a very good job of cleaning carbs. This is a
simple procedure you can do yourself and very cheaply.
SM has already corrected you on that issue.
If it's electrical it's going to probably be a trip to the shop as
it isn't likely from your posting that you'll be doing that yourself.
Other than an engine being simply worn out (or oil neglected),
nearly all problems come down to fuel or spark. And from
many years of mower experience --> it's a fuel problem 90%
of the time.
Since we can only guess, I would do the following.............
Check to make sure the vent is working onthe gas cap.
Change spark plug.
Make sure the "dead-mans" switch is working correctly and not sticking
(cables CAN stretch).
Like one poster suggested, when it won't run, try spraying a little
gas in the carb ot see if it is fuel related and check for spark. You
can't fix it if it isn't broken. :-)
If all this checks out ok, I am guessing a sticky valve or leaking
Hank <~~~~ professional guesser
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.