lawn mower

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  #1  
Old 03-23-10, 12:01 PM
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Question lawn mower

My lawn mower runs for about 15 minutes and then shuts off. We have a new coil on it and checked alot of different things and can't find the problem. we think it might be the carburetor but we aren't sure. I'd love to get some addvice from anyone who might know what to do to fix the problem.
 
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  #2  
Old 03-23-10, 12:10 PM
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I would check the filter first if it has one or if not simply check the flow of fuel to the carburetor by pulling the hose loose from the carb end and let the fuel drain into a container to make sure the flow isn't restricted. What it sounds like is the engine is using fuel faster than it is being replenished to the float bowl.
 

Last edited by the_tow_guy; 03-23-10 at 12:14 PM. Reason: Typo.
  #3  
Old 03-23-10, 12:29 PM
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thanks i'll give that a shot
 
  #4  
Old 03-23-10, 01:21 PM
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Try running it with the gas cap loose. The vent hole may be plugged. Very common.
 
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Old 03-23-10, 01:36 PM
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Righteousness!! lol thanks I'll try that
 
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Old 03-23-10, 01:45 PM
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Hey!! it's working sofar! Thanks for the tip!
 
  #7  
Old 03-23-10, 02:21 PM
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having the gas cap loose didny work and we checked the tube and it's clear. got any other ideas?
 
  #8  
Old 03-23-10, 02:34 PM
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Post the engine mfg, model, type code etc usually found on the metal engine shroud just above the park plug or on a tag by the muffler so we know what you have. Try checking for spark as soon as it quits, even though the coil is new it can still be failing. On some engines the fuel cap has a cone/bell shaped disk that comes loose and works it's way over the fuel outlet while the engine is running, so check the cap to see if it's innards are gone. Have a good one. Geo
 
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Old 03-23-10, 02:42 PM
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it's a briggs and stratton Craftsman 6.5 Hp engine. Model Number:917.376080
 
  #10  
Old 03-23-10, 03:19 PM
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ok, we're pretty sure that our coil is over heating. the mower ran for about 10 minutes and then shut off. we checked the spark plug and we couldn't get a spark. any ideas?
 
  #11  
Old 03-23-10, 04:09 PM
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No spark after 10 mins of running says the coil is heating up. Make sure grass is not stuck in the cooling fins and check the oil. Low oil can cause the engine to run hot. Also what color is the spark plug? That will tell if it is running lean. Lean running runs hot and is usually caused by a clogged carb.
 
  #12  
Old 03-23-10, 04:58 PM
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thanks! yea we checked the oil and it's good so we're guna try cleaning the carb. what do you mean by what color is it?? I thought they were all the same color/: what part changes color?
 
  #13  
Old 03-24-10, 12:49 AM
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If you checked for spark and there was none, then that's the problem. Try disconnecting the kill wire from the coil and see if it still shuts down. Be aware that you won't be able to shut it off without disconnecting the plug wire.
 
  #14  
Old 03-26-10, 03:42 AM
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hiiiii

Make sure grass is not stuck in the cooling fins and check the oil. Low oil can cause the engine to run hot. Also what color is the spark plug? That will tell if it is running lean. Lean running runs hot and is usually caused by a clogged carb.


plumbing contractor Temecula
 
  #15  
Old 03-26-10, 08:59 AM
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lame

We cleaned the carb and put it back together and started it and it ran for about a minute before it shut off. we disconnected the coil from the sparkplug and checked for spark and there wasnt one. got any ideas?
 
  #16  
Old 03-26-10, 10:06 AM
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Did you put a new coil on it or just a different coil? Do what Cheese suggested. Disconnect the kill wire from the coil, make sure you have the .010 gap between the coil and the flywheel (measure with a business card or a feeler gauge), then if no spark - replace the coil.
 
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Old 03-26-10, 11:40 AM
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sweeet!! thanks we'll try that
 
  #18  
Old 03-29-10, 08:45 AM
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Originally Posted by xXBoBXx View Post
thanks! yea we checked the oil and it's good so we're guna try cleaning the carb. what do you mean by what color is it?? I thought they were all the same color/: what part changes color?
The part of the spark plug that is inside the motor developes a color depending on the operating conditions. If the porcelain around the electrode is black and oily means that there are compression problems, tan and dry is fairly normal.
 
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