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Fixing a Lawn Mower That Won't Start


Gold Post Medal for All Time! 899 Posts
May 10, 2013

mowing the lawnWe have a Craftsman mower (with a Briggs and Stratton engine) that we have not taken very good care of. Not only did we not remove the gasoline before wintering it over, but we also did not maintain the air filter or spark plug. So it was not surprising that when we went to use it this spring it wouldn't start. However, with these simple steps we were able to get it running as good as new.

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Total Time: 20 minutes

Supplies:

  • spark plug
  • air filter
  • fresh gasoline
  • carb cleaner
  • gas siphon
supplies
 

Steps:

  1. Begin by siphoning out the old gasoline into a container for proper disposal. It is best to use one intended for this purpose, instead of using your mouth and a hose.
  2. siphon out gas
     
  3. Now add fresh gasoline and put the cap back on the gas tank.
  4. add fresh gas
     
  5. Remove the spark plug using a spark plug socket. Put the new plug in and reattach the wire.
  6. remove spark plug
     
    old and new spark plugs
     
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  7. Open the air filter housing and remove the filter. Some air filters can be washed and reused, however if it has been a long time you may want to just replace it.
  8. take out old filter
     
    dirty air filter
     
  9. Once the filter is out you need to spray carb cleaner directly into the carburetor. A few good sprays should do.
  10. spray carb cleaner
     
  11. Put the new air filter in and close the housing door.
  12. put in new filter
     
  13. Now is a good time to try starting the mower. Be sure to prime the mower with the priming button. It may take a few tries to get the mower going.
  14. start mower
     
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  15. I suggest running it for a few minutes the first time you start it. This will help get the new gas running through everything. Happy mowing!
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