Briggs&Stratton 126L02-0782-F1 not running properly. Craftsman 247.371170 push mower

[dmbcrsh]

Hello,
Need some help here. This mower sat for years and I filled the gas tank up. Tried to start it, it wouldn't start. Replaced the carburetor with a

Harbot 799866 Carburetor. Then replaced the spark plug with a champion861eco. The mower starts but its like its idling low and sputters. When I checked the spark plug. Its wet and has black on it. I've attached pictures of the plug and a short video of what it sounds like..

 

[Scrubcadet10]

be sure the auto6 choke is opening fully. You can do that by removing the air filter and filter cover, and the valve in the carb should be open. It works off of engine heat from the muffler by moving a thermostat to open or close the choke.
If the choke is closed try manually opening it to see if it runs better.
Here's a video about the choke system

taryl fixes sll suto choke - Google Search

 

[dmbcrsh]

be sure the auto6 choke is opening fully. You can do that by removing the air filter and filter cover, and the valve in the carb should be open. It works off of engine heat from the muffler by moving a thermostat to open or close the choke.
If the choke is closed try manually opening it to see if it runs better.
Here's a video about the choke system

taryl fixes sll suto choke - Google Search

Thank you for your reply Scrubcadet10. I will check this out and report back.

 

[dmbcrsh]

Hello Scrubcadet10. Thank you very much . this was my exact problem. Once I opened up the top of the lawn mower. I saw that the idle throttle was stuck. I released it and now its working properly..

Again, thank you for taking the time to let me know what the problem could be and providing a solution.

Have a great day