This is how I was able to easily fix my Yard Machines lawn mower from MTD that I purchased at Home Depot. The engine is the Briggs and Stratton 550E 140CC.

Parts Used: http://amzn.to/2EhBmHv

Here is the affiliate link to the replacement Carb that I used in the video

http://amzn.to/2EhBmHv

You can get the mag bowl I use Here:

https://amzn.to/2P2kfLJ