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Lawnmower shuts down when increasing throttle


jcraft's Avatar
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Join Date: Aug 2002
Posts: 355
NY

05-20-11, 06:56 AM   #1  
Lawnmower shuts down when increasing throttle

Hi All,
I have a snapper riding lawnmower that is probably 30 yeras old. has a 7hp engine. I have used it for the last 15 years with very little problems. I have used it twice this season with no issues until last night. I was cutting for about 15 minutes and all of a sudden it died. Now when I start the mower and have the blade disengaged, it idles fine and sounds good however, as I increase engine rpm with the throttle the engine dies at it starts to speed up. I can restart in idle but then the same thing happens again. Any idea what this could be. Thanks

 
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Pilot Dane's Avatar
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NC

05-20-11, 08:34 AM   #2  
You might have a jet clogged in the carburetor.

 
cheese's Avatar
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05-20-11, 09:39 AM   #3  
I agree, sounds like the carburetor needs some work/cleaning.


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Pilot Dane's Avatar
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05-20-11, 09:45 AM   #4  
I can speak with a bit of experience since it happened to me this morning mowing the grass at the office. Half way through the front lawn it died. I could start it fine but at partial throttle it ran rough and would die before I could get the lever to full throttle. A quick cleaning of the carburetor got it working fine. And while I was at it I changed the 8 year old fuel filter.

 
jcraft's Avatar
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05-20-11, 10:50 AM   #5  
IF you can let me know how you cleaned the carb. I never cleaned one before. did you completely disassemble or just spray carb cleaner. Thanks

 
Pilot Dane's Avatar
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05-20-11, 05:34 PM   #6  
It the engine has been sitting for a long time with gas in it I'll start with a full disassemble & soak but if the engine was running and suddenly develops a problem like not running at full throttle I try to start easy. Today I got lucky and all I had to do was remove the bowl and let the float drop to the wide open position. The flow of gas washed out whatever was slowing down the flow of fuel. My engine would not run at full throttle but would run briefly if I let it set for a minute which led me to think it was starved for fuel.

Usually though I have to remove the carb from the engine, disassemble and spray out all the passages. If that does not work then I soak the carb & pieces in cleaner and blow out the passages with compressed air.

 
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05-20-11, 05:57 PM   #7  
You didn't by chance run under something that could have bent the throttle linkage which could affect the running also. Have a good one. Geo

 
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