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Valve Spring Shim 1 x .688 x .030
Valve Spring Shim 1 x .688 x .030
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Valve Spring Shim 1 x .688 x .030

Part Number: B101
Online Price: $0.79
Universal .030" Valve Spring Shim – 1" OD x .688" ID
Availability: In Stock.

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Description

Universal Valve Spring Shim – 1" OD x .688" ID x .030" Thick


Dial in your valve train performance with this Universal Valve Spring Shim, precision-machined to .030" thickness with a 1" outer diameter and .688" inner diameter. Whether you're building a high-RPM small engine or fine-tuning an automotive valvetrain, this shim helps increase valve spring pressure without replacing springs.


By decreasing the valve spring’s installed height, this shim boosts both seat pressure and open pressure, enhancing valve control, reducing valve float, and improving engine reliability under load or at high speeds.


Important: Using shims without measuring installed height and total valve lift may result in coil bind. Always verify your spring specs before installation.


Shim Dimensions:

  • Outer Diameter (OD): 1.000"
  • Inner Diameter (ID): 0.688"
  • Thickness: 0.030"


Key Features:

  • Increases valve spring seat and open pressure for enhanced stability
  • Universal design fits many small engine and automotive applications
  • Great for tuning engines used in kart racing, mini bikes, and custom builds
  • Durable, precision-ground steel construction for consistent fit
  • Ideal for builders looking to fine-tune valve train dynamics


Common Uses:

  • Honda GX200, Predator 212/224, 196cc Clone engines
  • Tillotson, Wildcat, Ducar performance heads
  • Custom automotive cylinder heads
  • Small engine race applications, mini bikes, and go-karts

FAQ

Q1: What does this .030" valve spring shim do?

A: It reduces the installed height of your valve spring by .030", which increases both seat pressure (closed valve) and over-the-nose pressure (open valve). This helps reduce valve float and improves high-RPM valve control.


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

A: It’s a universal-fit shim commonly used in small engine performance applications like Honda GX200, 196cc Clones, Predator 212/224, Tillotson, Ducar, and other GX-style heads. It may also fit certain automotive or custom cylinder heads with matching dimensions.


Q3: What are the exact shim dimensions?

A:

  • Thickness: .030"
  • Outer Diameter (OD): 1.000"
  • Inner Diameter (ID): 0.688"
    Always verify that these specs match your valve spring seat and retainer dimensions before installation.


Q4: Can this shim cause coil bind?

A: Yes, if added without measuring the available spring travel. Always check your installed height, valve lift, and coil bind clearance before using shims to avoid potential engine damage.


Q5: Is this shim sold individually or in packs?

A: This shim sold individually, making it ideal for precise tuning or replacing specific worn or mismatched shims. Bulk packs may also be available—check product options for details.

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