Hot Cams 7.48mm Complete Valve Shim Kit HCSHIM01 — 1.20–3.50mm in 0.05mm Steps, 3 Each (4140 Steel)

Hot Cams HCSHIM01 is a complete 7.48mm valve shim kit with precision 4140 steel shims (1.20–3.50mm) in 0.05mm steps, designed to simplify valve clearance service on compatible dirt bikes.

This kit gathers three shims of every size from 1.20mm up to 3.50mm in 0.05mm increments, giving you the selection needed to adjust clearances without multiple orders. Each shim is forged from heat-treated 4140 steel for durability and stamped with its thickness for quick selection during maintenance. The set fits a wide range of four-stroke off-road motorcycles from leading manufacturers, making it a practical addition to any rider or mechanic’s toolbox.

Which bike models will this Hot Cams shim kit service?

The HCSHIM01 is engineered for many common four-stroke dirt bikes and dual-sport machines. It covers multiple year ranges across Honda, Kawasaki, Suzuki, and Yamaha two-fifties and smaller-displacement models, helping you match the exact shim size required by the valve spec.

• Honda CRF 150R/150RB (2007–2018) and CRF 250R/X (2004–2017), CRF 250L (2013–2018), NX 250 (1988–1990)
• Kawasaki KX250F (2004–2018) and Suzuki RMZ250 (2004–2018)
• Yamaha WR250F/WR250R/WR250X (2001–2018 variants) and YZ250F (2001–2013)
• Includes three identical shims per size to cover repeated or paired valve adjustments

How precise are the shim increments and how does that help valve adjustment?

The kit’s 0.05mm step size gives fine control when dialing in clearances, reducing the need for shimming more than once. Having three of each thickness lets you stack or swap shims to reach the exact specification called for in service manuals.

• Thickness range: 1.20mm to 3.50mm in 0.05mm increments
• Three shims per size for quick selection and stacking if required
• Laser-etched sizes on each shim speed up identification during a rebuild

What materials and markings are used, and why do they matter?

These shims are forged from 4140 alloy steel, a material widely used for its strength and wear resistance in rotating and valve-train components. Each shim is laser marked with its exact thickness so you can pick the right one under shop lighting without measuring every piece.

• Forged 4140 steel construction for wear resistance and consistent dimensions
• Laser-etched thickness markings for fast, error-reduced selection
• Manufactured to fit standard 7.48mm shim buckets used on listed engines

What tools or preparation are recommended before using the shim kit?

Basic valve maintenance tools and a service manual for your specific model are essential for safe and accurate adjustments. Clean work area, torque wrench, feeler gauge, valve spring compressor (if required), and a calibrated micrometer or shim gauge will help ensure correct clearances and reliable results.

• Refer to your motorcycle’s valve clearance specs before selecting shims
• Use a feeler gauge and micrometer for verification after installation
• Keep spare shims organized by size to speed future maintenance intervals

Who is this for: The Hot Cams HCSHIM01 kit is aimed at dirt-bike riders, home mechanics, and professional shops that service four-stroke off-road and dual-sport motorcycles. If you perform routine valve checks or rebuilds on compatible Honda, Kawasaki, Suzuki, or Yamaha models, this complete selection of 0.05mm-step shims reduces downtime and prevents repeated parts orders.