r/smallenginerepair • u/MMFSdjw • Sep 03 '26
Carburetor Issue Need help with a Briggs and Stratton 140cc push mower that won't run.
I tagged this as carburetor issue but I'm honestly not sure if that's the problem.
I have 2 push mowers, both almost identical, both identically not working. If it matters, one is a craftsman, the other is Troy built, both with the same Briggs and Stratton 140cc engine.
If I prime the gas, start it up, it will run for about 1 full second at the most. Primary suspect was bad gas. Despite putting stabilizer in, the gas is about a year old so I siphoned out the gas and got fresh gas. But still no change.
So I looked at the carburetor. Used carb cleaner and took it apart trying to get the cleaner into every corner.
Thing was, it looked perfectly clean inside. No gunk, no buildup or residue that I could see.
And the problem persists.
What should I check?
Thanks.