walkbehind wont start

[i cut with ferris]

ok my walkbehind wont start. it ran fine then it just stopped! it has a 12.5 kawi on it. has spark and fuel i changed the carb but still wont start. anybody have any ideas? thanks

[Patriot Services]

Flywheel key sheared? Check compression.
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[jsslawncare]

Bad safety switch. Disconnect the wiring harness coming from the motor going to the mower. It should run then if the motor is ok.

[Patriot Services]

How do you have spark with a bad safety switch?
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[i cut with ferris]

it turns off but wont fire up. i unplugged the switch just to make sure. all it does is back fire from the carb. i pulled the spark plug and it is wet. never had anything like this happen before.

[Patriot Services]

Backfire through the carb is indicative of a timing issue. Again I am thinking a flywheel shift caused by a sheared key. You don't have to physically hit something to cause this.
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[ReddensLawnCare]

When you tried to crank it was it hard to pull like it as a little seized? I had the problem with gas seeping through the carb overnight and the oil and gas mixed. Turn off the gas and start to remove the carb. If on a kholer it will be two bolts on the left front of the engine. As you begin to loosen and gas comes out, it's probably the same problem
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[i cut with ferris]

i am trying to think if the shaft was turning when i spun the flywheel. when i pull it it wants to fire. i dont think the gas is a problem had that happen before motor would leak gas if it was not turned off. the kolher was not my favorite motor.

[i cut with ferris]

Originally Posted by Patriot Services

Flywheel key sheared? Check compression.
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thanks it was the key. now the next problem is thats its back firing and lack of power. i put the old carb back on it just to make sure.

[Patriot Services]

Check valve clearance. An unseated valve will cause those problems.
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