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  5. .040" Valve Spring Shim 10 Pack for Honda/Clone 196 & Predator 212
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.040' Valve Spring Shim 10 Pack for Honda/Clone 196 & Predator 212
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.040" Valve Spring Shim 10 Pack for Honda/Clone 196 & Predator 212

Part Number: 168F-12900
On sale: $4.99 $3.99
.040" Valve Spring Shim 10-Pack for GX200, Predator Engines
Availability: In Stock.

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Description

.040" Valve Spring Shim – 10 Pack


Take control of your valve train setup with this .040" Valve Spring Shim 10-Pack, engineered for precise valve spring tuning in high-performance small engine builds. By decreasing the installed height of the valve spring, these shims significantly increase both seat pressure (closed) and over-the-nose pressure (at full lift), improving valve control at higher RPMs.


Perfect for racers and builders looking to fine-tune spring pressure for Honda GX200, Predator 212/224, and Clone 196–240cc engines, these shims offer an effective way to boost stability and reduce the risk of valve float.


Caution: Decreasing spring install height reduces overall spring clearance. Excessive shimming can lead to coil bind, which may cause engine damage. Always use proper tools to measure spring installed height, coil bind clearance, and seat pressure.


Applications:

Engineered for use with:

  • Honda GX200 / 196cc Clone engines
  • Tillotson, Ducar, and Wildcat performance heads
  • Predator 212, 224, and 240cc engines (Hemi and Non-Hemi)
  • GX200-style heads used in mini bikes and go-karts


Shim Dimensions:

  • Thickness: .040"
  • Outer Diameter (OD): 0.835"
  • Inner Diameter (ID): 0.570"

Compare dimensions to your retainer and spring seat before installation to confirm fitment.


Key Features:

  • Raises valve spring pressure for better high-RPM control
  • Helps prevent valve float in racing and performance applications
  • Precision-machined from durable steel
  • Ideal for performance small engine builders
  • Sold in packs of 10

FAQ

Q1: What is the purpose of a .040" valve spring shim?

A: The .040" shim reduces your valve spring's installed height, significantly increasing both seat and open pressure. This helps improve valve control and reduce valve float at high RPMs—especially important in performance or racing engine builds.


Q2: How do I know if .040" is the right thickness for my engine?

A: It depends on your target spring pressures and available clearance. Thicker shims increase spring pressure more but reduce coil bind clearance. Measure your installed height, target pressure, and total lift to determine if .040" is safe for your application.


Q3: What engines are these shims compatible with?

A: These shims fit Honda GX200, 196cc Clones, Tillotson, Ducar, Wildcat, and Predator 212, 224, and 240 engines. They're designed for GX200-style heads commonly used in mini bikes and go-karts.


Q4: Can using .040" valve spring shims damage my engine?

A: Only if installed without proper measurements. Too much shim thickness can cause coil bind and lead to valve train failure. Always verify installed height and total valve lift using accurate measuring tools.


Q5: What are the shim dimensions?

A: Each shim measures:

  • Thickness: .040"
  • Outer Diameter (OD): 0.835"
  • Inner Diameter (ID): 0.570"
    Ensure your spring seat and retainer are compatible with these specs.

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