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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 26285
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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I have a 13.5 ohv 135-180 engine and it is "cycling or

Customer Question

I have a 13.5 ohv 135-180 engine and it is "cycling or Pulsing" for a few seconds then stalls. I have changed the carb, fuel filter and plug with no improvement. Ideas?
Submitted: 7 months ago.
Category: Small Engine
Expert:  Curtis B. replied 7 months ago.

Will it start right back up?

Expert:  Curtis B. replied 7 months ago.

Is it a gravity flow from the fuel tank, or does it have the pulse fuel pump?

Customer: replied 7 months ago.
it starts right up (but won't keep running) and it is gravity fed
Expert:  Curtis B. replied 7 months ago.

Ok, is the flow from the tank to the new carburetor at least 1/4 cup in 15 seconds?

Customer: replied 7 months ago.
Expert:  Curtis B. replied 7 months ago.

What is the engine model numbers? Briggs or Tecumseh

Customer: replied 7 months ago.
tecumseh
Expert:  Curtis B. replied 7 months ago.

You are not getting enough fuel through the carburetor. You replaced the fuel filter and carburetor, did you replace the fule line? I'm thinking that you have debris in the needle valve of the new carburetor from the old fuel line.

Customer: replied 7 months ago.
no I did not replace the fuel line. if there is debris in the carb can I flush it out?
Expert:  Curtis B. replied 7 months ago.

Yes, you will have to remove the float bowl and the float and needle valve, then the fuel line, and blow back from the needle valve passage , outwards to clean any debris/ It takes just a small piece to plug the needle valve port and restrict the flow.

Expert:  Curtis B. replied 7 months ago.

Typical carburetor. link.

Customer: replied 7 months ago.
this will take a while. how can I contact you tomorrow??
Expert:  Curtis B. replied 7 months ago.

Sure, I should be here.

Expert:  Curtis B. replied 6 months ago.

I see question still open, did you find problem?