Starts but sputters a bit and runs but then cuts out?
A couple of common culprits that give these symptoms are the seal on the gas cap. If it is not sealed all the way, it will do exactly what you are describing. Also, a dirty carb will cause this. Taking apart the carb is not recomended but you can buy some carb cleaner and spray it in. Good luck.
SOURCE: MTD Yardman push mower runs fine for awhile then cuts off.
Try buying a new plug first but if it continues then I would say that there is debris in the carb.
SOURCE: mower starts won't keep running
check the bowl under the primer button see if there is dirt in there watch how it comes apart,then send me email cant get mine back together,mine was dirty should help.
SOURCE: I HAVE A MTD YARD MACHINE 12A446B729. RUNS FIVE
was having the exact same problem with my 6.5 hp Toro lawnmower with a
Tecumseh engine. The engine would start up okay but after a few
minutes of mowing, the mower would start missing and eventually shut
down. I would pull and pull and pull on the starter rope, getting
angry and frustrated and eventually going back in the house to let it
cool down.
I looked up all kinds of information and I finally decided it was a bad
coil (something about the resistance being low when the mower wasn't
hot and then when it heated up the coil would conduct enough
electricity to somehow make the engine shut down.)
I called a local shop and wanted to get an estimate on replacing the
coil. I have no clue about engines so I dared not get into the guts of
the mower myself. He told me to check the gas cap. HUH??????
He told me to make sure there wasn't a part missing out of it. I
thought, what the heck would a gas cap have to do with the engine
shutting down. Well, apparently there is a mechanism on these caps
that prevents a vacuum from pulling on the fuel system and my gas cap
indeed had a part missing. To verify this, I cut the grass for about 5
minutes. When it started to run rough, I took the gas cap off to allow
pressure to escape from the gas tank and voila! it started to purr
like a kitten.
So, I'm only out $4 for a new gas cap and I'm as good as new. Man I
wish I was more mechanically inclined so I hope your problem is as easy
to solve as this one.
Hope this helps!
SOURCE: My LawnBoy mower 195 cc 4 cycle that starts fine.
It sounds as though it is starved for fuel. Check the pinhole vent in the fuel filler cap. if it is plugged, the engine will still draw fuel, until a vacuum is pulled on the tank, resulting in no fuel. If this doesn't fix you. check for adequate fuel at the carb, and wirk either forward or backwards from that point, depending on what you find. I'm betting on the vent!
Try it; it may be just the thing!
Best regards, --W/D-- please feel free to rate this solution! Thanx!
SOURCE: My Troy Bilt Self Prop. Z-start won't keep running...
There may be a cracked fuel line, cracked primer bulb, loose carburator, dirt/trash in the carb....it sounds like a fuel supply problem. Hard to tell with out hands on.
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