Mastering the Briggs & Stratton 20 HP Intek Carb: Throttle and Governor Linkages

Maintaining a smooth-running engine requires proper calibration of the throttle and governor linkages in your carburetor. In this comprehensive article, we will delve into the intricacies of these linkages for the Briggs & Stratton 20 HP Intek carburetor. By understanding their functionality, you can troubleshoot and adjust them effectively, ensuring optimal engine performance.

Understanding Throttle & Governor Linkages

The throttle linkage is responsible for controlling the air-fuel mixture entering the engine. It is connected to the throttle lever, which you operate to control the engine speed.

The governor linkage, on the other hand, regulates the engine speed by controlling the throttle opening. It ensures that the engine maintains a stable speed under varying loads.

Throttle Linkage Adjustments

1. Throttle Cable Adjustment:

   • Why it matters: A properly adjusted throttle cable ensures smooth acceleration and prevents engine surging.
   • How to adjust: Start with the engine off. Loosen the locknut on the throttle cable bracket and adjust the cable by moving it in the direction that increases or decreases tension. Tighten the locknut.
   • Target adjustment: The throttle cable should have 1/16" to 1/8" of slack when the throttle lever is in the idle position.

2. Idle Speed Adjustment:

   • Why it matters: The idle speed determines how fast the engine runs at its lowest setting.
   • How to adjust: Refer to your engine's owner's manual for the recommended idle speed specification. Adjust the idle speed screw on the carburetor to set the desired speed.
   • Target adjustment: Adjust the screw until the engine runs smoothly at the specified idle speed.

Governor Linkage Adjustments

1. Governor Spring Adjustment:

   • Why it matters: The governor spring controls the tension on the governor linkage, affecting the engine's speed regulation.
   • How to adjust: Locate the governor spring at the back of the carburetor. Adjust the tension by tightening or loosening the tension screw on the spring.
   • Target adjustment: Refer to your engine's owner's manual for the recommended governor spring tension specification.

2. Governor Arm Adjustment:

   • Why it matters: The governor arm controls the throttle opening based on engine load.
   • How to adjust: Locate the governor arm on the carburetor. Adjust its height by loosening the mounting bolts and moving it up or down.
   • Target adjustment: Adjust the arm height until the engine speed is stable under varying loads.

Common Mistakes to Avoid

1. Overtightening Linkages: Avoid overtightening the linkage nuts and bolts, as this can restrict movement and affect performance.
2. Incorrect Adjustments: Always refer to the engine's specifications when making adjustments to ensure optimal performance and fuel efficiency.
3. Lack of Lubrication: Periodically lubricate the linkage pivot points to prevent friction and ensure smooth operation.

Call to Action

Properly adjusted throttle and governor linkages are crucial for a smooth-running Briggs & Stratton 20 HP Intek engine. By following the guidelines provided in this article, you can troubleshoot and adjust these linkages effectively, ensuring optimal engine performance for years to come. Consult your engine's owner's manual for specific instructions and specifications.