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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 26530
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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Once the motor warms up the motor dies, it will

Customer Question

for my Scag once the motor warms up the motor dies, it will start again but has to be fully choked in order to run then as soon as you engage the blade it starts to struggle and won't cut or dies
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Submitted: 9 months ago.
Category: Small Engine
Expert:  Curtis B. replied 9 months ago.
What engine do you have? Twin engine? Run cylinder test, May have to wait until it is warm. Loosen the spark plug wires, and with engine idling, remove one wire at a time. Engine should continue to run. If it dies when wire is removed, the opposite cylinder is not firing. Check it for spark.
Customer: replied 9 months ago.
its the twin Kohler
Customer: replied 9 months ago.
cranking it now
Customer: replied 9 months ago.
This did not return any results. I did notice that once the motor was warm the engine would bogg down and then return to normal Idle for a few minutes before it would die. At this time if I was to try and lower the throttle level then the mower would just die
Customer: replied 9 months ago.
any thoughts?
Customer: replied 9 months ago.
when its starts gets warm and starts to act up I pull the plug on one cylinder the motor will actually start sounding better on one cylinder then it does on the two
Expert:  Curtis B. replied 9 months ago.
But it will run on either cylinder There is a fuel solenoid in the carburetor, is it staying open? It has to have 12 volts, as long as key is on. If it closes, engine starves for fuel. ??
Customer: replied 9 months ago.
how can I tell if it is staying open?
Customer: replied 9 months ago.
before it dies it will just pulse-sate for about 5 mins, starts to pulse-sate slow slow then it just increases then it sounds like it trys to stay running for a few more mintues at a low low idle before it just gives out
Expert:  Curtis B. replied 9 months ago.
Has to be a lack of fuel. Locate the solenoid, and see if this is the type that the plunger can be removed. Remove the inner tip and run test.
Customer: replied 9 months ago.
there is a wire running into the bottom of the carb bowl, is that the solenoid?
Expert:  Curtis B. replied 9 months ago.
Yes, it would be the only electrical part on the carb.
Customer: replied 9 months ago.
i have it out now, can you tell me how to test it?
Customer: replied 9 months ago.
seems to be to parts, I'll try to break the tip loose from the wire end
Customer: replied 9 months ago.
ok, I have it broken down, let me know how to test it
Expert:  Curtis B. replied 9 months ago.
Can the inner tip be removed?
Customer: replied 9 months ago.
yes
Expert:  Curtis B. replied 9 months ago.
Remove the inner parts, reinstall it as a dummy, and run mower.
Customer: replied 9 months ago.
ok, i reinstalled and I plugged the wire back in so everything is there like it was orginally without the inner parts. Mower is running now
Expert:  Curtis B. replied 9 months ago.
OK, let it run and see if problem is gone!
Customer: replied 9 months ago.
still doing the same
Customer: replied 9 months ago.
i ran it out in the yard for about 10-15 mins once it got how it did the same
Expert:  Curtis B. replied 9 months ago.
So solenoid is not bad. Have you checked the fule supply up to th e fule pump? Fuel tank is vented?
Customer: replied 9 months ago.
all seems normally but that fuel filter is clogged pretty bad, I took the hose off one side and it barely leaked out. Changing that now
Expert:  Curtis B. replied 9 months ago.
OK>
Customer: replied 9 months ago.
i think that may have been it, I let it run for a good time and no problems
Expert:  Curtis B. replied 9 months ago.
OK> Good job! Please rate to close. Thanks.