These adjustments will control idle speed, idle quality, and initial responsiveness/ acceleration of the engine. Adjusting the Idle Speed and Mixture. 11. Note RPM. It surges between 1200 -1500 RPM, but never runs smoothly and repeatedly dies. More likely the governor arm clamp has come loose from the governor shaft going thru the engine block OR the governor inside has disintegrated OR the screws have come out of the throttle butterfly where it attaches to the butterfly shaft OR the intake manifold has loosened allowing air to leak causing engine to over speed. A great way to help avoid these problems would be to perform an annual tune-up using a Briggs & Stratton engine Maintenance Kit. Over time, debris and constant vibration can skew the speed and mixture in the carburettor, which leads to poor performance and black smoke from the exhaust. Briggs & Stratton Proper Idle Mixture Screw & engine RPM settings? The screw in the center of the side of the carburetor body is the Idle Speed adjustment. 6) Release throttle lever. Carburetor tuning at idle and low speed is accomplished by adjusting the Idle Mixture Screw, the Pilot (or Idle) Jet, and Idle Speed Screw. According to Briggs & Stratton, 80 percent of lawn mower manufacturers in the United States choose to use Briggs & Stratton … Models built before 1982 employed a magneto, points and condenser system to generate spark for the spark plug. Adjust (bend) the main governor spring tab to achieve 3800 RPM. Briggs & Stratton is a manufacturer of small engines used in lawn and garden equipment such as lawn mowers, rototillers, snow blowers and more. Allow engine to idle for a couple of seconds and then move throttle back to full throttle and verify maximum of 3800 RPM. 5) Hold Throttle Lever against Idle Speed Adjustment Screw again, and readjust idle RPM to 900 RPM. The optimum setting for the carburettor is to run around 1750rpm. I am unable to get my engine to idle smoothly at that slow of speed. The 12.5 HP Briggs and Stratton engine has an idle speed adjustment screw below the fuel bowl of the carburettor that can be adjusted in just a few minutes to keep the engine running efficiently. How to Adjust a Briggs & Stratton Throttle Link. Keeping your Briggs & Stratton mower engine running smooth is no easy task. I spent more than an hour trying to find info to work out what sort of tension I needed on both springs from the Briggs and Stratton site (some-one had put the throttle spring onto a random hole in the plastic [rocker] arm). If your engine is running roughly, either at high speed or when in idle, you may need to set a Briggs & Stratton carburetor adjustment … One area to maintain regularly is the carburettor and linkages. Release throttle lever, lever should return to idle position, if not loosen nut until lever drops freely to idle. Idle Speeds for Briggs & Stratton engines used on a variety of outdoor power equipment applications. 10. These Briggs & Stratton engines utilize an adjustable carburetor to create the gasoline and air mixture for the piston to fire. Reply. Briggs and Stratton Adjusting Governor 3.5HP. On some float-type carburettors, you can adjust the air-fuel mixture and engine speed at idle. Since 1982, Briggs & Stratton engines have used a solid-state ignition. 9. I have a 17 and a half horse Briggs and Stratton motor Murray lawn mower it turns over good don’t need spark plugs and solenoid I can put some gas in the carburetor in a run that gas out and it won’t run again could the carburetor be stopped up ... After it has been running for 5 plus minutes I can adjust idle down to 800. 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