Fixing a Lawn Mower That Won’t Start

Fixing a Lawn Mower That Won’t. We have a Craftsman mower (with a Briggs and Stratton engine) that we have not taken very good care of over the winter. However, with these simple steps we were able to get it running. View the Full Project:

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27 thoughts on “Fixing a Lawn Mower That Won’t Start

  1. I did everything except use the carb cleaner. I'll get some and try 1 more time. Very frustrating to have to pay someone for something I can do myself!

  2. I did everything, new gas, new oil, new spark plug, new air filter, carb cleaner, primed it and except for a few sputters, it still won't start. any suggestions? I probably should have left it alone like I usually do!


  4. Yeahh !.. Thanks !.. This worked.. My mower wouldn't start, so I changed the spark plug, drained the gas out and put fresh gas in.. That didn't work.. I found this video. Replaced the air filter(it was very dirty) and sprayed the carburetor with carb cleaner and voila ! it started right up… Thanks again.

  5. @Tom Smith first off this video isnt gonna help anyone because the spark plug and air filter are not why mowers dont start and gas takes a while to go bad. often what is the problem is people let them sit with fuel in them and it causes carburetor issues. You have to disassemble the carb and clean it because im pretty sure this guys mower surged like a son of a bitch when he got it to run. BTW blame briggs thats more than likely your engine.

  6. Thanks – that's exactly what I needed. Got the stuff, did what you showed and it started!!!! My sparkplug looked worse than the one you showed… eek. =)

  7. You don't clean the carb by just spraying it like this guy did. You have to dissemble it and take it apart and spray carb cleaner on it, and it doesn't hurt to coat it down with carb cleaner and then make sure the holes on the carb is not clogged. Once you have done this, just put it back on and it should be fine. Also, make sure the carb bowl is not dried up with dry gas, if it is then you need to clean it out with carb cleaner and you can use a wool to also help.

  8. you asshole if its not broken don't fix it…  i did what thrifty  did sprayed it started up right away….thankyou thrifty  great video

  9. +ThriftyFun Here's another "Youtube expert" who hasn't a clue.
    He throw$ part$ at something before determining the problem. I doubt if it started when he was done because he left the old gas in the fuel line and the carburetor. All the fresh gas in the world does no good if it makes it no further than the tank itself.
    Any lawn mower will start 1st pull if in a correct state of tune.
    Notice how this "expert's" starter rope is wrapped around the handle nut hardware at 1:17? That should be a clue of his mechanical abilities, not to mention flooding the carburetor with carb cleaner spray AND punching the primer bulb. 

  10. Just because you have a 5 gallon gas can that does not mean you need to buy 5 gallons of fuel. If you only use 3 gallons of fuel during a season then only buy 3 gallons. If you have any left over at the end of the season put it in your vehicle and use it up. Do not let it sit in the garage and get old and stale. That is asking for problems. Always use fuel stabilizer when you buy fuel and at the end of the season run the tool out of fuel.

  11. Old bad gas causes problems. When storing gas, a vehicle, mower or a tool it is important to use it up yearly if you added Stabil or Seafoam to it when you filled up. It is easier to run the vehicle out of fuel and put fresh in yearly than deal with the problems that bad fuel causes.  Most small engine problems are due to gas going bad and not because of ethanol. Small engines have ALWAYS had problems with stale fuel gumming up the carburetor when left in for long periods of time.
    When a small engine like a lawn mower, leaf blower, chain saw, is being put up for the winter run it out of fuel before putting it away.  In the spring when filling your gas can for the first time add some Sta-Bil or Seafoam to the gas to extend its life. Gas generally starts to go bad after 30 -60 days. By adding the fuel stabilizer it will extend its life. When you put equipment away for the season run it out of fuel first. Do this and your old mower will last longer trouble free.

  12. you can't let your mower sit for more than 3 months with out running the mower otherwise the gas will go bad in the carburator. and if you do add some fuel conditioning.

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