Briggs vs. Tecumseh
From a current related post about bringing a Tecumseh engine back from the dead:
I like both engines. It remains to be seen what will become of Tecumseh. Limiting my comments to the smaller engines.
1. The Briggs L head bolts are almost always loose when I see an engine for service. Very rare with the Tecumseh.
2. The Briggs bowl-carbs almost never require service and the jets never seem to clog. Tecumseh bowls are frequently filled with varnish as well as the main jet.
3. The simple Briggs tank-mounted carb is reliable but with the new ethanol-based fuels, the diaphragms are in frequent need of replacement.
4. The left-side mounted Tecumseh carbs, found on much Sears equipment can have gas supply issues. A full tank of gas sometimes won't make it to the carb without loosening the bowl nut. Never a problem with the Briggs carb.
Other than these quirks that I have seen, both are good engines.