Briggs & Stratton — Final Carburetor Adjustment
Adjustments
From a Briggs & Stratton service manual — check it applies to your exact model before use.
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Before you start
- Idle mixture screw: turn clockwise until it just seats. DO NOT FORCE.
Procedure
- All carburetor adjustments must be made with the air cleaner installed.
- Start and run engine at low speed for approximately five minutes (or until temperature gauge needle moves from C/COLD).
- With control lever in SLOW position, hold throttle lever against idle speed screw and adjust idle speed to 1200 RPM.
- Slowly turn idle mixture screw clockwise until engine speed just starts to slow (lean mixture).
- Then slowly turn idle mixture screw counterclockwise until engine speed just starts to slow (rich mixture).
- Turn idle mixture screw to mid point between rich and lean.
- Hold throttle lever against idle speed screw and re-adjust idle speed to 1500 RPM, or equipment manufacturer's specification.
- If equipped with an idle mixture limiter cap, install at this time.
Tools required
- Knock out pin Tool #19135 (limiter cap) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Initial setting: manual choke turn 1/2 turn counterclockwise from lightly seated; automatic choke 1-1/4 turn
- Idle speed 1500 RPM; adjustment at 1200 RPM
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.