My mower is well over due for a tune up, and a few weeks ago it started to sputter and stall while in use, so I cleaned the air filter and put some sea foam in with the gas, it ran better the last time I used it but now it wont start at all, so I changed the spark plug still nothing, I tried to check to see if there was a spark by removing plug from engine but leaving it in cord and saw no spark when I pulled the cord.
Clean the Plug and replace the Seafoam gas with fresh. Althiough the Seafoam is a cleaning agent, it cuts back on the gasolines octane and it can slightly foul plugs.
SOURCE: mower will not start
Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,
but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you
buy and install a new carburetor repair kit, because the diaphragm will
get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
Please do not forget to rate me, Thanks
Good Luck, I hope this helped
SOURCE: old craftsman pull cord
Your carbs main jet is blocked most likely.
Take the carb bowl off and look at the bolt near the top of the threads.
You should see a very very small hole. If you can see through it you need to clean it with a fine strand of metal wire.
Also work the float up and down to make sure it isnt stuck or unable to flow when the float hangs free.
Put it back together and try it out!
Good luck and be careful!
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