Valve Upper Retainer for Secure Raptor Valve Operation

Valve float can derail your race—stop it with the Valve Upper Retainer, SKU 555147. This compact piece secures the upper end of the valve spring in your Briggs Raptor flathead engine, ensuring springs compress and expand reliably under high RPMs.

• Prevents retainer slippage for consistent valve action
• Superseded by 691760 for improved heat tolerance
• Lightweight yet strong to handle racing stresses

By keeping everything locked in, it supports accurate timing, which is key to unleashing full horsepower without misfires. Teams find it invaluable for organized rebuilds, as it simplifies disassembly and reassembly. The result? Smoother engine cycles that help you accelerate faster and maintain speed through gears.

For competitive karting, where precision matters, this retainer is your ally in building a responsive valvetrain that responds instantly to your inputs.