Still starts then stops after doing many common repairs

[Nicapyke]

Hey folks,

Kind of stumped here. I have a Troybilt TB110 from 2011 (model: 11A-A26M011) with a Briggs and Stratton 126T02-0675-B2 engine. It starts up briefly and then stops. Here's what I've done so far:

• Replaced the air filter
• Replaced the carburetor
• Replaced the ignition coil
• Drained fuel tank and replaced with fresh fuel
• Cleaned fuel tank cap
• Changed engine oil
• Replaced spark plug

My googling hasn't helped me identify some less common causes of my lawnmower's problem(s). What might else it be? Maybe something further downstream from the carburetor? Thanks in advance for help troubleshooting.

 

[Rivets]

More questions than answers. OEM or knockoff carb? Primer, choke or auto-choke carb? Set the air gap on coil to .010”? Does it restart after it shuts down? With these answers we can give you ideas on how to proceed.

 

[dougand3]

Assuming Auto Choke-Tstat-Air Vane model. Pull the air filter and look at choke plate. It should be closed when engine is cold. If not: tstat, air vane or spring problem. If you have a primer bulb, push it a few times, start engine, have a helper push bulb every second or 2. See if it keeps running. It may warm enough to stay running with an open choke.

 

[cpurvis]

Sounds to me like you have a blockage in the fuel line.

 

[Nicapyke]

More questions than answers. OEM or knockoff carb? Primer, choke or auto-choke carb? Set the air gap on coil to .010”? Does it restart after it shuts down? With these answers we can give you ideas on how to proceed.

OEM carb. How can I tell the difference between choke or auto-choke? Yes, air gap set to .010". It does restart after it shuts down, but it takes several more pulls. Thank you!

 

[Nicapyke]

Assuming Auto Choke-Tstat-Air Vane model. Pull the air filter and look at choke plate. It should be closed when engine is cold. If not: tstat, air vane or spring problem. If you have a primer bulb, push it a few times, start engine, have a helper push bulb every second or 2. See if it keeps running. It may warm enough to stay running with an open choke.

Thank you, I will inspect the choke plate and report back. I can identify the air vane and spring, but am not sure what a tstat is.

 

[Nicapyke]

Sounds to me like you have a blockage in the fuel line.

I had thought the same thing (and it may still be true) but the bowl under the carb reliably fills and the fuel line itself does not appear to be obstructed. Could I be missing something else? Thank you.

 

[Scrubcadet10]

The thermostat is on the muffler.
Look up "How Briggs auto choke works" on YouTube and look for a video by Taryl Fixes All.

 

[cpurvis]

I had thought the same thing (and it may still be true) but the bowl under the carb reliably fills and the fuel line itself does not appear to be obstructed. Could I be missing something else? Thank you.

How are you checking that the carb reliably fills?

 

[Mower King]

The thermostat is on the muffler.
Look up "How Briggs auto choke works" on YouTube and look for a video by Taryl Fixes All.

I rest my case!......lol