KOSO Valve Spring Seat Shim Kit

KOSO Valve Spring Seat Shim Kit

  • Sale
  • $14.55

Compatibility:

  • Yamaha: CYGNUS GRYPHUS  / BWS (ZUMA) / X-FORCE

  • Yamaha: N-MAX 155 / AEROX 155 / NVX 155

  • Yamaha: R-15 V3 / R-15 V4

The KOSO Valve Spring Seat Shim Kit (MR073100) is an essential tuning component for engine builders. It allows for precise adjustment of valve spring installed height and pressure, ensuring optimal valve train stability under high-performance conditions.

Key Features & Specs

  • Complete Tuning Set: Includes three thickness variations to match specific engine requirements:

    • 0.5 mm (x4 pieces)

    • 1.0 mm (x4 pieces)

    • 2.0 mm (x4 pieces)

  • Function: Adjusts the installed height of the valve springs to increase spring preload (seat pressure).

  • Performance Benefit: Increasing spring pressure helps prevent valve float at high RPMs without the immediate need for buying heavier springs.

  • Durability: Manufactured from high-grade hardened steel to withstand extreme pressure and wear.

Why You Need This

When upgrading camshafts or rebuilding cylinder heads, factory tolerances often vary. KOSO shims allow you to balance spring pressures across all valves or stiffen the spring rate for higher RPM reliability.

Price is set (12PCS)
Made In Taiwan