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Valve Spring Shim 1 x .688 x .015
Valve Spring Shim 1 x .688 x .015
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Valve Spring Shim 1 x .688 x .015

Part Number: C101
On sale: $0.79 $0.50
Universal Valve Spring Shim – .015" Thick | 1" OD
Availability: In Stock.

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Description

Universal Valve Spring Shim – .015" Thickness


Optimize your valve spring setup with this Universal Valve Spring Shim, engineered to fine-tune spring pressure across a wide range of small engine and automotive applications. Measuring .015" thick with a 1" outer diameter and .688" inner diameter, this shim provides a practical solution for increasing seat pressure and stabilizing the valve train in performance engines.


By reducing the installed height of the valve spring, this shim increases both closed (seat) pressure and open pressure, improving valve control at higher RPMs and helping prevent valve float—critical for racing, karting, and high-performance builds.


Note: As with all valve train modifications, proper measurements are essential. Excessive shimming can lead to coil bind and engine damage. Be sure to verify spring installed height, total lift, and available clearance before installation.


Shim Specifications:

  • Thickness: .015"
  • Outer Diameter (OD): 1.000"
  • Inner Diameter (ID): 0.688"


Key Features:

  • Universal fitment for a wide range of valve spring seats and retainers
  • Increases spring pressure for improved high-RPM stability
  • Ideal for tuning seat pressure without changing springs
  • Precision-machined for consistent thickness and fit
  • Durable steel construction for long-lasting performance


Common Applications:

  • Small engine builds (Honda GX-series, Predator, Clone engines)
  • Automotive cylinder heads with compatible spring seats
  • Kart racing, mini bikes, and other high-RPM setups
  • Custom engine projects requiring fine-tuned spring pressure

FAQ

Q1: What does this universal valve spring shim do?

A: This shim reduces your valve spring's installed height by .015", which increases seat and open spring pressure. This added tension improves valve train stability, especially at higher RPMs in performance or racing engines.


Q2: What engines or applications is this shim compatible with?

A: The shim is universal and fits any application with a compatible valve spring seat and retainer. It’s commonly used in small engines (GX200, Predator, Clone), kart racing engines, mini bikes, and some automotive cylinder heads.


Q3: What are the shim's dimensions?

A:

  • Thickness: .015"
  • Outer Diameter (OD): 1.000"
  • Inner Diameter (ID): 0.688"
    Make sure these measurements match your valve spring seat and guide setup before installation.


Q4: Can using this shim cause coil bind?

A: Yes, if used without proper measurement. Adding shims reduces valve spring clearance, which can lead to coil bind and engine damage. Always verify installed height, valve lift, and spring specs before installation.


Q5: Is this shim sold individually or in packs?

A: This listing is for an individual universal valve spring shim. Check your project’s needs—multiple shims may be required for complete setups or further tuning.

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