Smooth intake action starts here—the intake valve spring (SKU 555060) compresses and releases with engineered tension, keeping your Raptor's valves responsive for efficient air intake every cycle.

• High-tension coil for durability
• Prevents valve float at high RPMs
• Superceded by 690520 for modern fits

This small part packs a punch, enhancing overall engine breathing to help you surge ahead of the pack.

Frequently Asked Questions

Q: Why has this part been superseded by 690520?

A: Briggs & Stratton updated the design to 690520 to provide improved material consistency and tension stability, ensuring better performance and longevity for modern engine builds.

Q: How do I know if my valve spring needs to be replaced?

A: You should inspect your valve springs if you notice a loss of power at high RPMs or if the engine begins to experience "valve float." If the spring has lost its free length or shows signs of fatigue, it should be replaced immediately to maintain proper engine breathing.

Q: Can I use this spring in a modern LO206 or World Formula engine?

A: This specific spring (555060) is designed for older Raptor-style engines. For modern LO206 or World Formula engines, always refer to your specific engine manual or the updated part number (690520) to ensure compliance with current racing regulations.

Q: What is the benefit of a high-tension valve spring?

A: A high-tension spring ensures the valve closes rapidly and stays seated firmly against the valve seat. This prevents valve float at high RPMs, which is critical for maintaining consistent compression and peak horsepower during a race.

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