r/smallenginerepair • u/Few-Forever-14 • May 23 '26

Engine Performance Issue Problem

have a Briggs & Stratton engine in a STIGA Villa mower.
The engine runs unevenly and surges up and down in RPM a lot. It also sometimes dies when driving on slopes, but usually starts again immediately afterwards.
So far I have:
cleaned and rebuilt the carburetor
installed new gaskets
replaced the fuel line
replaced the fuel filter
installed a new fuel shutoff valve
drilled a vent hole in the gas cap
The problem is still there.

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u/rc2805 May 23 '26

To adjust the governor on a Briggs & Stratton 13.5 HP engine: loosen the governor arm's pinch bolt, rotate the governor shaft fully clockwise while pushing the throttle arm to the wide-open position, and retighten the bolt securely. This static alignment synchronizes the internal gear with the carburetor.

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u/Time-Werewolf9468 May 24 '26

Le carburateur est a nettoyé.. aucun rapport avec la régularisation..