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Rocky , start by replacing spark plug and remove old gas for new.
check links below for why mowers do not start.
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Take off the rope cover. Turn it upside down. Shove a scewdriver in between the round part and the housing. Undo the knot that holds the pull rope in. Take screw driver out ( this wheel is spring loaded so hold it tight) turn the wheel counter clock wise till it stops and back it off till the hole for the rope is lined up with the hole on the side of cover. Put screw driver back in to hold wheel. Push one end of the pull rope through the metal cover and fish it to the hole in the wheel. Use a pick or needle nose pliers to pull enough out so you can tie a knot in it. Push knot in the slot that holds the knot. Put pull handle on other end. Remove crew driver and let it unwind. This should be finished try it and put into back on your mower. Good luck.
I can't tell you how many pieces of small equipment I have been given for free because it "just won't start" or "won't stay running". Start by draining the tank and cleaning it out - use a good carb cleaner. It only takes a grain of sand to create a problem. You may have to take the carb apart and clean that out too.
First thing to check on a Tecumseh; pull the half inch bowl nut (main jet) out of the bottom of the carburetor. Give it a good cleaning with carb cleaner then pay special attention to the teeny tiny hole that is right at the very top of the threads. It's so small you can hardly see it and if it clogs, your mower won't start. Best of luck to you.
Drain the fuel or when you remove the float bowl bolt (also the main jet), then hold up on the float to keep the needle on the seat so gas won't go everywhere. When you have that brass bowl bolt off, clean it! Use nothing metal on it. Pay close attention to the small hole in the bottom and along the smooth unthreaded part at the other end. Use carb/choke cleaner to blast gum and dirt out of those very small fuel orifices. I recommend installing an inline fuel filter also. A shut off valve is recommended too, that way if the needle in the carb sticks open, the crankcase won't be polluted with gas. Usual symptoms on a clogged lawn mower main jet though, are after pushing primer bulb, engine runs about 3 seconds. Try the brass bolt cleaning and post back if needed.
It is a tecumseh , remove screws from intake pipe to block
mark holes for linkage don'tstretch springs.
Remove bottom bowl nut it is reg thread so turn counter clock wise . parts needed 631021b bowl gasket and needle and seat,
36786 intake gasket,
632547 2 o rings,
36905 air filter .
Use a can of carb cleaner auto zone spray all holes even the one
on the bowl nut , take out center plastic main nozzle out put on the new o rings put back in , some time the nozzle will brake part 3 640019 .
Remove seat can use comp air or make tool out of paper clip don't
scratch the side when pulling out