Lawn Mower Repair Briggs & Stratton 550 EX, Mower Won’t Start

Briggs and Stratton 550EX Lawn Mower engine on a Yard Machines walk behind mower won’t start. This video shows how to service the carburetor, and the linkage. These engines are used on many mowers including: Yard Machines, Craftsman, Briggs and Stratton and many more. This video is courtesy of The Alameda Repair Shop in Alameda, CA



47 thoughts on “Lawn Mower Repair Briggs & Stratton 550 EX, Mower Won’t Start

  1. You sir helped my a$$ out!! thank you! I took the dang carberator off a couple times but didn't clean it enough… got my air compressor and really went to town blowing those holes and bam!!! Thank you!

  2. Just wanted to say thank you, you save me 90.00. Very informative video. Only had the mower for less then a year and was surprise to find it wouldn't start after a few months of not using it. Now I just need to find a video on how to store the mower so it won't happen again.

  3. Which Briggs and Stratton OHV engine would you recommend? 500E(140cc) 575EX(140cc) 625E(150cc) 650EXI(163cc)?
    Thanks for your answer!

  4. Thank you Sir for this awesome video.. I am a girl who knows nothing about machines and who only got her lawnmower last summer and I tried replacing the sparkplug, filter etc.. but it didn't start. I followed ur video and cleaned out the carbanator and I scream out in joy when it started with one pull!! Thank you for the comments below too cos I didn't even have the 5/12 sockets to open the screws… I am so happy! THank you everyone

  5. When I first opened the carb there was liquid in there so I drained it out. I re opened it there was liquid in there. After I disassembled the carb I tried to blow thru to see if air circulation goes through but it does not. How could I fix this problem? Please and thanks

  6. Thanks much! Very similar to the comments posted below, I ran through the same steps and my push mower is working perfectly.  You saved me some $$ and additional headaches.

  7. Thank you from Maryland for the helpful video. Hard to believe so many of the same machines having the identical problem. This will be my third season with this mower and it doesn't have 2 hours total run time on it and so far has been trouble free and easy starting, but with your instructions and renewed confidence, I will try the fix tomorrow morning

  8. All I had to do was take the air filter out, open the choke, and then use some Carburetor Cleaner to spray the crap out of it. Took 2-3 rounds but finally got it to start. Good video though on how to take apart the whole thing should I need to.

  9. Hi Sr.

    I am having the same issue with the same model of mower, I'll be doing the same you did. Question what are the two sprays you use during the reparation..?

    Thanks in advance

  10. Is it OK to use regular carb cleaner? I've seen a couple vids that say no, but most of them use the regular stuff.

  11. what kind of fuel does this machine need? thanx im a newbie at this, so im not to familiar with the exact fuel compound, for this machine. Need help thanx!

  12. My riding mower was in the shop. The 550ex is my backup mower. After following your directions it cranked on the first pull! I learned a lot watching your video. I watched it twice before disassembly and referred back to it when reconnecting the linkages. Thanks for saving me money and about 3 weeks of down time – which is the backlog at the repair shop.

  13. I cleaned out the carb and realized my seat pin was missing.
    How is that even possible?
    I found a replacement on amazon, replaced it and blew into the hose and got the same results that you did, showing that it should be working.

    Put everything back together, sprayed some "good stuff" but the mower turns over once, and then shuts off.

    Both the governor, and choke look to be ok with the spring tension, the tank is full and the oil is within acceptable range.
    I also cleaned out the float pin, and didnt look to be plugged up.

    The spark plug is brand new and working. What else could be the issue?

    Thanks for the vid.

  14. Thanks for the video. Especially about the float pin. I watched another video to do this and once I was done the carb was leaking gas everywhere. I couldn't figure it out until I watched you video and you blew into the gas hose. I did that and that's when I saw I didn't have the pin inserted properly on one side.

  15. Thank you for great video!
    I fixed mine by watching this video. You saved my mower and my wallet 🙂

  16. Thanks much , my rubber and plastic seal came out -carburetor leaking -I did not put on properly, when mounting to the engine.

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