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Start ShoppingHot Cams 5PK948325 9.48mm Valve Shim Refill Pack - Replacement Shims for High-Performance Engines
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Description
Upgrade your engine's sealing performance with Hot Cams' 9.48mm valve shim refills. These precision-engineered shims ensure optimal compression and durability for high-performance engines, making them essential for racers and enthusiasts seeking peak mechanical efficiency.
Key Features
- 9.48mm Diameter Precision: Engineered for exact fitment in valve train systems requiring 9.48mm shim specifications.
- Refill Pack Compatibility: Designed as a direct replacement for Hot Cams master shim kits, ideal for maintenance and bulk storage.
- Valve Train Optimization: Enhances sealing performance and reduces leakage in high-performance engine applications.
- Variable Shim Configurations: Each refill pack contains unique shim thickness combinations for specific engine requirements.
Why Choose This Product
Hot Cams' 9.48mm shim refills deliver unmatched reliability for valve train systems. These shims are manufactured to exacting tolerances to maintain compression integrity and prevent oil leakage. As a refill pack, they offer cost-effective solutions for mechanics and riders needing spare shims without purchasing full master kits. The variable shim configurations ensure compatibility with a wide range of high-performance engines, while the durable construction withstands extreme operating conditions. Whether you're tuning a racing engine or maintaining a street bike, these shims provide the precision needed for optimal engine performance.
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Upgrade your engine's sealing performance with Hot Cams' 9.48mm valve shim refills. These precision-engineered shims ensure optimal compression and durability for high-performance engines, making them essential for racers and enthusiasts seeking peak mechanical efficiency.
Key Features
- 9.48mm Diameter Precision: Engineered for exact fitment in valve train systems requiring 9.48mm shim specifications.
- Refill Pack Compatibility: Designed as a direct replacement for Hot Cams master shim kits, ideal for maintenance and bulk storage.
- Valve Train Optimization: Enhances sealing performance and reduces leakage in high-performance engine applications.
- Variable Shim Configurations: Each refill pack contains unique shim thickness combinations for specific engine requirements.
Why Choose This Product
Hot Cams' 9.48mm shim refills deliver unmatched reliability for valve train systems. These shims are manufactured to exacting tolerances to maintain compression integrity and prevent oil leakage. As a refill pack, they offer cost-effective solutions for mechanics and riders needing spare shims without purchasing full master kits. The variable shim configurations ensure compatibility with a wide range of high-performance engines, while the durable construction withstands extreme operating conditions. Whether you're tuning a racing engine or maintaining a street bike, these shims provide the precision needed for optimal engine performance.| SKU | GM176B1884 |
|---|---|
| MPN | 5PK948325 |
| Brand | Hot Cams |
| Category | Engine |
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Frequently Asked Questions
This is a 9.48 mm diameter shim refill pack for Hot Cams shim kits. It is intended to replenish specific sizes within a 9.48 mm master kit. For the exact thicknesses and quantities in 5PK948325, refer to the Hot Cams catalog or the label on the kit packaging, as it can change by production run.
It will fit engines that use 9.48 mm shim-under-bucket valve shims (common on many modern Japanese 4-stroke MX, off-road, and street bikes). Check your owner’s or service manual for shim diameter and confirm it is 9.48 mm before purchasing.
5PK948325 is a refill package, not a full master kit. It is meant to top off or replace commonly used sizes in an existing Hot Cams 9.48 mm shim kit.
Yes, Hot Cams shims are marked by size, but you should still verify thickness with a micrometer for precise valve adjustment.
Yes, as long as the diameter and thickness match OEM spec. Many mechanics mix OEM and aftermarket shims, but they should be measured and installed according to the service manual.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- Factory service manual for the specific vehicle
- Feeler gauges (metric)
- Micrometer or digital caliper (to verify shim thicknesses)
- Torque wrench
- Basic metric hand tools (sockets, ratchets, Allen/hex keys)
- Magnet pick-up tool or shim removal tool
- Clean shop towels
- Engine assembly lube or clean engine oil
Pro Tips
- Measure every shim with a micrometer and write the value and valve location in a worksheet or on a printed diagram of the head.
- Work on one cylinder or one cam at a time to reduce the chance of mixing parts.
- Use a small magnet or shim tool to remove/install shims so you don’t scratch the buckets.
- Turn the engine over by hand (using the crank bolt) at least two full revolutions and re-verify cam timing marks before starting.
- Always set clearances toward the loose end of the OEM spec for performance engines that see high RPM.
- Blow debris away from the valve cover area before removing it to avoid contamination inside the engine.
Common Mistakes to Avoid
- Not recording original shim sizes and locations before removal
- Mixing up cam caps or installing cam caps backwards or in the wrong position
- Failing to torque cam cap bolts to OEM spec and sequence
- Rotating the engine with the timing chain/cams installed incorrectly (risk of valve-to-piston contact)
- Not rechecking valve clearances after changing shims
- Assuming shim size from package label without verifying with a micrometer
Comparison vs Stock/OEM
Functionally equivalent to OEM valve shims in size and purpose, but sold as a refill pack to service multiple valves and engines.
Improvements
- Cost-effective when servicing multiple vehicles or performing frequent valve checks
- Convenient organization of commonly used sizes for 9.48 mm applications
- Designed specifically for compatibility with Hot Cams master shim kits
Considerations
- Not specific to a single OEM part number; users must determine required diameters and thicknesses from their service manual.
- Being a refill pack, it may not include every possible thickness range like a full master kit.
Durability & Warranty
Expected Lifespan
Under normal use, hardened steel valve shims typically last the life of multiple valve adjustment intervals; they are replaced due to size requirements, not wear, unless damaged.
Warranty
Standard aftermarket hard parts warranty from Hot Cams (details vary by seller; typically covers manufacturing defects, not wear or installation errors).
Maintenance
No direct maintenance on the shim itself. Follow the valve clearance inspection interval specified in the vehicle’s service manual and replace shims when clearances fall outside spec.
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