Lawnmower shuts down when increasing throttle

Reply

  #1  
Old 05-20-11, 06:56 AM
Member
Thread Starter
Join Date: Aug 2002
Location: new york
Posts: 356
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
 
Sponsored Links
  #2  
Old 05-20-11, 08:34 AM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 17,756
You might have a jet clogged in the carburetor.
 
  #3  
Old 05-20-11, 09:39 AM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,814
I agree, sounds like the carburetor needs some work/cleaning.
 
  #4  
Old 05-20-11, 09:45 AM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 17,756
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.
 
  #5  
Old 05-20-11, 10:50 AM
Member
Thread Starter
Join Date: Aug 2002
Location: new york
Posts: 356
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
 
  #6  
Old 05-20-11, 05:34 PM
Group Moderator
Join Date: Mar 2003
Location: NC, USA
Posts: 17,756
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.
 
  #7  
Old 05-20-11, 05:57 PM
Member
Join Date: Jun 2006
Location: St. Louis
Posts: 2,365
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
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes