User Manual: CLSR2U Engine Governor and Choke Springs

1. Product Overview

This manual provides essential information for the installation and maintenance of CLSR2U replacement springs for various engines, including those found in Toro, Craftsman, and Troy Bilt lawn mowers. These springs are designed to replace original parts 790849 (air vane choke spring) and 699056 (governor spring).

The air vane spring (the shorter spring) is an integral component of the auto-choke system. Its function is to maintain the correct tension on the air vane, which is crucial for proper engine starting and operation, especially in varying temperature conditions.

The governor spring (the longer spring) plays a critical role in engine speed regulation. It applies tension to the throttle mechanism, allowing the engine to maintain a consistent RPM under different loads, ensuring smooth and efficient performance.

2. Package Contents

The package includes the following components:

• 1 x Air Vane Choke Spring: This is the shorter spring, designed to replace part number 790849.
• 1 x Governor Spring: This is the longer spring, designed to replace part number 699056.

Image: The CLSR2U replacement spring set, showing both the longer governor spring and the shorter air vane choke spring. These components are essential for maintaining proper engine function.

3. Compatibility

These replacement springs are compatible with a wide range of BS (Briggs & Stratton) engines. They are commonly used in lawn mowers from various manufacturers, including but not limited to:

• Toro Lawn Mowers
• Craftsman Lawn Mowers
• Troy Bilt Lawn Mowers

Always verify the original part numbers (790849 for the air vane spring and 699056 for the governor spring) to ensure proper fitment for your specific engine model.

4. Installation Instructions

Replacing engine springs requires careful attention to detail. If you are unsure about any step, it is recommended to consult a professional mechanic or refer to your engine's specific service manual.

General Installation Steps:

1. Safety First: Before beginning any work, ensure the engine is turned off, cooled down, and the spark plug wire is disconnected to prevent accidental starting.
2. Locate Existing Springs: Identify the air vane choke spring and the governor spring on your engine. They are typically located near the carburetor and throttle linkage. Note their exact attachment points and orientation. Taking a photograph before removal can be very helpful.
3. Remove Old Springs: Carefully detach the old springs. They may be under tension, so exercise caution.
4. Install New Springs: Attach the new CLSR2U springs to their respective locations.
   • The shorter spring (790849) is the air vane choke spring. It connects to the air vane and the carburetor linkage, maintaining choke tension.
   • The longer spring (699056) is the governor spring. It connects the governor arm to the throttle linkage, controlling engine speed.
   Ensure the springs are securely attached and have the correct tension and length as designed. They should not be stretched excessively or be too loose.
5. Verify Connections: Double-check all connections to ensure the springs are properly seated and the linkages move freely without binding.
6. Reconnect Spark Plug: Once installation is complete and verified, reconnect the spark plug wire.
7. Test Engine: Start the engine and observe its operation. Check for proper idling, acceleration, and overall speed regulation.

Image: Detailed view of the shorter air vane choke spring, showing its compact coiled body and attachment loops. This spring is crucial for the engine's auto-choke mechanism.

Image: Detailed view of the longer governor spring, featuring its extended wire and coiled section. This spring is vital for regulating engine speed and maintaining consistent performance.

5. Maintenance

While these springs are designed for durability, regular inspection can help ensure optimal engine performance and longevity.

• Visual Inspection: Periodically inspect both springs for signs of wear, stretching, corrosion, or damage. Look for any deformation in the coils or attachment points.
• Cleanliness: Keep the area around the springs and linkages clean from dirt, debris, and oil buildup, which can impede their movement.
• Replacement: If a spring appears worn, stretched, or damaged, replace it promptly to prevent engine performance issues. These springs are designed to be easily replaceable.

6. Troubleshooting

If you experience engine performance issues after replacing the springs, or if you suspect the springs are the cause of existing problems, consider the following:

• Engine Not Starting or Hard Starting:
  • Ensure the air vane choke spring (the shorter one) is correctly installed and providing proper tension to the choke mechanism. A loose or missing choke spring can prevent the engine from choking correctly, leading to hard starting.
• Engine Surging or Unstable RPM:
  • Check the governor spring (the longer one) for proper installation and tension. If the governor spring is stretched, weak, or incorrectly attached, the engine's governor system may not be able to maintain a stable RPM, causing surging.
• Incorrect Spring Placement: Verify that the correct spring is installed in the correct location. The shorter spring is for the air vane choke, and the longer spring is for the governor.
• Linkage Obstruction: Ensure that no other engine components or debris are obstructing the free movement of the springs or their associated linkages.

If issues persist after checking these points, it may indicate a problem beyond the springs, and professional diagnosis is recommended.

7. Product Specifications

8. Warranty and Support

CLSR2U stands behind the quality of its products.

Return Policy:

This product is eligible for a 30-day refund or replacement policy from the date of purchase. Please refer to the retailer's return policy for specific instructions on initiating a return or replacement.

Manufacturer Support:

For further assistance or inquiries regarding the product, please contact the manufacturer, CLSR2U, through the retailer's platform or their official channels if available.