On Sat, 19 May 2018 11:33:48 -0700 (PDT), Robert11
wrote:

Hello,

Would be most grateful for any help or thoughts on this:

Have a 10 yr old Toro GPS 22" self propelled Lawn Mower.

New Spark Plug
New Air Filter.

Prime it the 3X they say to do, hold down the
handle, and pull.

Starts right up, each time.

But, after about only 5 seconds conks right out.
Each and every time.

Pulling handle again won't start it again.

If I re-prime again, starts right up again, and stops after the 5 seconds.

I'm out of ideas.

Any idea what might be going on, and how, hopefully, to correct ?

Thanks,
Bob
Main jet in the carb is plugged. soaking it in sea-foam may help.
But about 2 oz of seafoam in half a tank of FRESH (preferably ethanol
free) gasoline. Prime and start and repeat, If there is a mixture
screw open it about 1/2 turn from current setting.

Let sit for a while and reprime and start. After numerous tries it
should stay running a bit longer. Eventually the jet will clear, and
the engine will continue running. Then it willstart running rich -
re-adjust mixture screw.

If this doesn't work the carb will have to come apart and be cleaned