Sears riding lawnmower. Smooth idle but rough, loud and poor power when full throttle
Check fuel valve is fully open. Check that fuel flows freely from to the carburetor input fitting... just remove line at carb and it should be a full steady stream of fuel.
Check that the primer bulb functions.
Be sure the O ring between backside of carburetor and engine intake is in good condition and in place.
Check breather tube from crankcase to air filter base is not cracked or damaged. Check the gasket between carburetor and air filter base is in place and properly oriented.
Parts diagram reference below.
https://www.jackssmallengines.com/jacks-parts-lookup/manufacturer/briggs-stratton/briggs-stratton-engine/100000-19z999-series/120k00-to-120k99/120k02-0110-e1
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