On all 2-cycle motors there is a screen on the exhaust muffler. These motors need 3 things to run and they are fuel, spark, and air. Now to get air flow it has to come in one side via the air filter then out the otherside throw the exhaust. These screen are put there for admission i just remove them. To locate this screen look at the muffler do you see a smaller metal peace attached to the muffler it is attached with 3 #2 phillips head screws. I you make sure the motor hasn't been running first the remove these 3 screws and remove the small metal peace you will see the screen just remove screen then reach the small peace of metal with 3 screws and it should run fine.
SOURCE: Engine runs great for 10 minutes and then stalls.
Believe
it or not, your gas cap is clogged up with dirt and debris. When a
carburetor is unable to get a constant flow of air from outside,
pressure builds up on the fuel tank. The fastest way to determine
whether or not this is the problem is as follows.
As you are
using your Mower, at that point when it begins to stall out, loosen
the gas cap so that you release the pressure that is built up in the gas
tank. If the engine begins to regain power, then you know it is a
clogged gas cap. (Simply get a small wire and clear the breathe holes in
the cap.) If the engine dies even after loosening the gas cap, then you
may want to check to make sure the air breather is clean. ( A dirty air
breather can cause the engine to over heat and stall out.)
If none of this seems to help, then it is probably a bad Ignition Coil.
Good Luck!
Jim
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