Question about Briggs & Stratton Garden

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RPM fluxuates/pulsates Just did a 100 hour oil change. Air filter didn't look too bad so I just cleaned it. Now throttle/RPM fluxuates (or ''pulsates'' - revs up/down rapidly) UNTIL I put it under load. Under load it levels out. Also I can level it out with about 1/3 choke. Taking the air filter complteley out doesn't change it. Never a problem until suddenly now. Any ideas would be appreciated. Craftsman Mower - 24hp Briggs & Stratton - 48" deck - 102 hours

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It sounds like a piece of dirt is in carburetor.You could try the quick clean first,remove the flywheel screen and the plastic engine shroud.The top of the carburetor will be exposed now.Remove the 3 small screws from the plat on top of the carb.Use air or carburetor cleaned and blow out these passages. Be sure to cover with a rag when doing this to shield your face from spray back.Test run and see if that helps,if not you will have to remove the carburetor and disassemble it to clean it.

Posted on Jul 31, 2009

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Why does it stall at 100% throttle?


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Clean your Throttle body with throttle body cleaner or Deep Creep made by Seafoam. When the carbon and varnish build up in your throttle body get's hot, it gums up the IAC (Idle air control) valve which help moderate your engine's rpm to keep it from stalling.
If the IAC is stuck due to the gum of the carbon and varnish in your throttle body, you have stalling issues which you have described. Start with that and replace your air cleaner filter since your going to clean your throttle body.
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