Briggs & Stratton — To Adjust the Carburetor
Adjustments
From a Briggs & Stratton service manual — check it applies to your exact model before use.
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Before you start
- Do not force the needle valve or idle screw against its seat or you will damage both
Procedure
- Completely close needle valve by turning clockwise as far as possible; do not screw up too tight or use force
- From closed position open needle valve one to one and one-quarter turns
- After the engine has started and warmed up make a final adjustment with the choke wide open, turning the needle valve to the point where the engine operates most smoothly with full load
- If the choke must be kept partially closed several minutes, the setting is too lean; open the needle valve a notch or two (turn to left)
- Idle adjustment screw setting is about a half to three-quarters of a turn open
- Throttle lever adjustment screw is set at the factory to permit an idling speed of about 1,200 R.P.M.
Specs & values
- Idling speed about 1,200 R.P.M.
Source: Briggs & Stratton service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.