Black smoke? Sounds like carburetion or valves. Does choking the unit help when it acts up? If it does, carburetion is your problem
I’m happy to assist further over the phone at https://www.6ya.com/expert/layne_0fccff498c319c32
SOURCE: 6 yr old mower starts, won't run
sounds like a plugged high speed jet in carb - you can attempt to prime again , push at least 7-8 times - once it fires continue to push primer to keep running - it may clear out the carb if this doesnt work the carb will need to be removed and cleaned
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: where do you drain the oil on a 4 hp yard machine
to drain the oil then you open the oil cap and tip it over and let the oil drain out.
SOURCE: lawn mower keeps dying
Remove gas cap. If mower now runs without stalling, your problem is the vent in the gas cap is blocked. Replace the cap. Common problem!
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