NotTaR of small Gasoline Engines and Rotary Lawn Mowers : Some problems with Briggs and Stratton e..  
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Some problems with Briggs and Stratton engines

(From: Mike Brandt (mwbran1@uswest.com).)

A quite common problem with these engines is the gasket between the carburetor and engine. It is usually a thick fiber gasket and sometimes gets blown out if engine ever backfires. This is more common with age, as the nuts holding carb on do sometime get loosened. Also gum buildup can and does clog the main and low-speed jets at times which means removing carburetor. Cleaning out with a good carburetor cleaner then blowing out all passages. This happens quite often here where they add 10% alcohol to gasoline. Gas goes bad a lot quicker than without alcohol!