Briggs and Stratton 550EX Won't Start!



The Briggs and Stratton 550 EX has the new plastic carburetor. No Start Problem this needs a good going through. In this video, I’ll show you how to remove, drain, disassemble (completely), clean and re-assemble.

(From Briggs and Stratton):

The 550ex Series™ Push Mower Engine. Powerful, yet economical. Performance and value rolled up into one unbeatable package.
Overhead Valve (OHV) Engine Design
OHV engines run cooler and cleaner for better fuel economy and longer engine life.
ReadyStart® Engine Starting System
No prime, no choke, no worries. Just pull for power.
Starts in 2 attempts – or B&S fix it for free.*

Briggs and Stratton 550EX Lawn Mower engine on a Troy-Bilt Push Lawn mower doesn’t start. In this video, I’ll show how to service the carburetor, and drain the old gas. These engines are used on many mowers including: Yard Machines, Craftsman, Briggs and Stratton and many more. Troy Bilt MTD Craftsman

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22 thoughts on “Briggs and Stratton 550EX Won't Start!

  1. I just purchased a new Brigg and Stratton self-propelled lawn mower today, and it won't start. A mechanically inclined neighbor checked the filter, poured a little gasoline in the open area of the filter (making sure that it actually drained inside), and pulled the starter string, the mower immediately started, but didn't run long. He checked the spark plug to make sure it was firing, and it was. What to do next?

  2. You are spot-on
    After watching your video I followed your simple instructions put it all back together it fired second pull

  3. Should the throttle cable be moving the lever by the carb? It seems like mines missing a spring or something because that’s not moving.

  4. I did all that last year and it ran fine for the rest of the season.
    ……
    Today it wont start AGAIN so im done with the Briggs garbage and it's going to the curb for trash pickup.
    ……
    Damn shame Briggs makes such garbage.
    That mower is only 2 years old and kept INSIDE.
    ……..
    My 26 year old lawn boy has never had a single problem and it sets outside under the deck.

  5. I tried the simple remove-and-clean of the jet mechanism shown in another YouTube video with only temporary success. You challenged me to take the whole thing apart. I did it with my 13-year-old daughter and learned a lot. And now it runs like it's brand new! Starts on the first pull, too! Thank you for a very practical demo. I learned a lot.

  6. I have removed the carburetor 3 times to clean it, each time it is as clean as when I installed it last. the float doesn't have a hole in it, the the springs and attach rods correctly attached and adjusted(bending wise), I have swapped out the spark plug and cleaned the contacts for it, I cleaned off all rust from the contacts and wheel from pull mechanism, flushed gas tank(washed it out, checked for leaks, and let dry before putting in brand new gas), and my mower(Briggs&Stratton 550ex) is EXACTLY like the one in this video. No matter what I do I can not get this mower to stay running. I spray starting fluid in the carb, and pull the handle, and it starts, but immediately dies. I am out of options, I was hoping you could help. Any other ideas?

  7. Thanks for the video. I just bought that same mower used and it was acting up, so I emptied the gas tank and unscrewed just the bottom of the carburetor out to let the fuel empty. Put fresh fuel in it, but now it won't start and it makes popping sounds. What do you think it could be?

  8. I have a husqvarna with the 550 ex motor on it, it runs fine and cold starts with 2- 3 pulls, but if I stop in the middle of mowing it will take 10-15 pulls for it to start. What do you think the problem could be?

  9. Steve's Small Engine Saloon recommends enlarging the brass hole on the jet to allow fuel to flow more freely and reduce clogging. I am planning to give this a try as I've taken the carb apart (and cleaned it out) three times! I love the 550EX engine when it's running well, but it's a royal PIA when it's got the all-to-often carb problem.

  10. Your instructions worked! I had a flooded carburetor and the mower would not start. I was about to take it in for service, but the repair turnaround time was 7-10 days since there were 35 other lawn mowers waiting for service/repair. So I checked for a repair video and found yours, which was for the exact same model. Thank you for the detailed and easy to follow instructions. You saved me time and money (@$60-$100).

  11. I have a troy bilt self propelled mower rear wheel drive. The wheels will spin if i lift them off the ground but they won't pull weight of the mower. I checked the gears in the wheels themselves they are like new. I'm hoping the belt is slipping but it's probably the transmission knowing my luck. Was wondering if you have any advice? Maybe how to go about finding the exact problem and fixing maybe you've seen the problem before.

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