Engineered for exact fit in GX200 Clone setups, this .010" valve spring shim fine-tunes spring tension to prevent excessive wear. Racers rely on it to maintain consistent valve timing, translating to smoother revs and quicker throttle response during high-speed corners.

• Boosts overall engine stability for aggressive track sessions
• Minimizes vibration that can sap precious horsepower
• Essential for custom builds aiming for peak RPM performance

Whether rebuilding after a tough race or optimizing for competition, SKU JF168-1246-10 delivers the precision needed to shave seconds off lap times. Install easily and feel the difference in power output right away.

Frequently Asked Questions

Q: Why do I need a .010 inch valve spring shim for my GX200 clone engine?

A: Valve spring shims are used to adjust the installed height of your valve springs. Adding a .010" shim increases the seat pressure, which helps prevent valve float at higher RPMs and ensures consistent valve timing for better engine performance.

Q: How do I know if I need a .010 shim versus a different thickness?

A: The correct shim thickness depends on your specific engine build and the measured installed height of your valve springs. Racers typically use a spring height micrometer to measure the gap and select the shim that achieves the manufacturer's recommended seat pressure.

Q: Can I stack multiple valve spring shims?

A: While it is possible to stack shims to reach a specific height, it is generally recommended to use a single shim of the correct thickness to ensure a flat, stable base for the valve spring and to prevent potential alignment issues.

Q: Is this shim compatible with other clone engine parts?

A: Yes, this shim is designed for standard GX200 clone valve train setups. It is compatible with most aftermarket valve springs designed for these engines, provided the inner diameter of the spring matches the shim dimensions.

Q: Does installing this shim require special tools?

A: You will need a valve spring compressor to remove the valve springs and retainers. We also highly recommend using a valve spring height micrometer to verify your measurements before and after installation to ensure your engine is tuned correctly.

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