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Start ShoppingHot Cams 5PK948305 Valve Shim Refill Pack - Precision Metric Shims for Motorcycle/ATV/UTV Engines
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Description
Precision-engineered valve shims for overhead-cam engines, these Hot Cams refills ensure optimal valve clearance adjustment and peak engine performance. Ideal for motorcycle, ATV, and UTV enthusiasts seeking reliable, durable solutions for valve train maintenance.
Key Features
- Hardened Steel Construction: Durable, wear-resistant shims designed for long-term performance in high-stress engine environments.
- Metric Flat Valve Shims: Precision-cut for accurate valve clearance adjustment in shim-under-bucket or shim-over-bucket designs.
- Thickness-Specific Refills: Customizable thickness options for precise tuning of valve gaps without replacing entire shim kits.
- OEM Diameter Compatibility: Specially sized for OEM shim diameters (e.g., 7.48 mm, 8.90 mm) to ensure perfect fit and function.
- Versatile Application: Suitable for a wide range of overhead-cam engines across motorcycles, ATVs, and UTVs.
Why Choose This Product
Hot Cams Shim Package Refills offer unmatched precision and reliability for valve train maintenance. By using OEM-compatible thicknesses and hardened steel construction, these shims ensure smooth engine operation, reduce noise, and extend engine life. Their compact refill design saves time and cost compared to full kit replacements, making them a must-have for serious riders and mechanics.
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Precision-engineered valve shims for overhead-cam engines, these Hot Cams refills ensure optimal valve clearance adjustment and peak engine performance. Ideal for motorcycle, ATV, and UTV enthusiasts seeking reliable, durable solutions for valve train maintenance.
Key Features
- Hardened Steel Construction: Durable, wear-resistant shims designed for long-term performance in high-stress engine environments.
- Metric Flat Valve Shims: Precision-cut for accurate valve clearance adjustment in shim-under-bucket or shim-over-bucket designs.
- Thickness-Specific Refills: Customizable thickness options for precise tuning of valve gaps without replacing entire shim kits.
- OEM Diameter Compatibility: Specially sized for OEM shim diameters (e.g., 7.48 mm, 8.90 mm) to ensure perfect fit and function.
- Versatile Application: Suitable for a wide range of overhead-cam engines across motorcycles, ATVs, and UTVs.
Why Choose This Product
Hot Cams Shim Package Refills offer unmatched precision and reliability for valve train maintenance. By using OEM-compatible thicknesses and hardened steel construction, these shims ensure smooth engine operation, reduce noise, and extend engine life. Their compact refill design saves time and cost compared to full kit replacements, making them a must-have for serious riders and mechanics.
| SKU | GM8A525D7B |
|---|---|
| MPN | 5PK948305 |
| Brand | Hot Cams |
| Category | Engine |
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Frequently Asked Questions
It is a Hot Cams shim refill pack intended to replenish specific thicknesses in a compatible Hot Cams valve shim kit. It is used when adjusting valve clearances on engines that use that same shim diameter and thickness range.
Match three things: (1) your engine’s shim DIAMETER (e.g., 7.48 mm, 9.48 mm, etc.), (2) the thickness range specified in your service manual, and (3) the main Hot Cams shim kit part number you are refilling. Then confirm on the retailer or Hot Cams fitment chart that 5PK948305 is the correct refill for that kit.
Yes, as long as the shim diameter and thickness match OEM specs. Many riders mix Hot Cams shims with OEM shims, but you must verify diameter and thickness carefully with a micrometer and confirm they seat properly in the bucket or retainer.
You’ll need a feeler gauge to measure valve clearance and basic hand tools to access the cams and buckets. Some engines require a special valve shim tool to depress the bucket without removing the cams; others require removing the cams entirely. Your service manual will specify the correct method.
The shims themselves don’t increase power; they simply allow you to set valve clearance within the correct range. Proper valve clearance can restore lost performance and improve starting and reliability if the valves were previously out of spec.
Installation Guide
Difficulty
Medium
Est. Time
1 hr 0 min
Tools Required
- Service manual for your specific machine
- Feeler gauge set (metric)
- Micrometer or digital caliper (to verify shim thickness)
- Basic metric socket and wrench set
- Torque wrench
- Magnet pick‑up tool or small pick (to remove shims)
- Clean shop rags
- Engine assembly lube or clean engine oil (for reassembly)
Pro Tips
- Lay out a diagram of your cylinder head (INT/EX, cylinders 1‑4, etc.) and write down each measured clearance AND each shim thickness you remove.
- Use a micrometer to verify shim thicknesses even if they are laser‑marked; markings can wear or be hard to read.
- Only change ONE variable at a time – calculate and install new shims, then rotate the engine by hand and re‑measure all clearances before reassembling the top cover.
- Blow off and wipe the shim area clean before removing shims so debris doesn’t fall into the engine.
- Always follow the OEM timing and torque procedures when loosening or tightening cam caps; improper sequence can warp caps or damage the head.
Common Mistakes to Avoid
- Not confirming the correct shim DIAMETER (e.g., 7.48 mm vs 9.48 mm) before ordering/refilling
- Failing to record original shim sizes and locations before swapping them
- Measuring valve clearance with the camshaft NOT positioned at the correct base‑circle location (lobes not fully away from the bucket)
- Mixing up intake and exhaust shims or reinstalling shims in the wrong positions
- Not re‑checking valve clearances after rotating the engine through at least two full revolutions
- Working without the OEM/service manual torque specs and cam timing procedure
Comparison vs Stock/OEM
Functionally equivalent to OEM valve shims when the correct diameter and thickness are used; they directly replace OEM shims in compatible engines.
Improvements
- Cost‑effective compared to buying individual OEM shims
- Convenient assortment in one pack for frequently used thicknesses
- Compatible with common Hot Cams master shim kits for shops and frequent tuners
Considerations
- You must match the correct shim diameter and thickness to OEM specs; using the wrong diameter can damage the engine.
- Always verify thickness with a micrometer for critical race engines.
- Keep notes of which positions use aftermarket vs OEM shims for future service records.
Durability & Warranty
Expected Lifespan
Under normal use, hardened steel valve shims are effectively long‑life components; they are typically reused many times unless damaged, worn, or out of required size range.
Warranty
Hot Cams generally offers standard manufacturer warranty against defects in materials and workmanship; verify specific terms for part number 5PK948305 with your retailer or Hot Cams.
Maintenance
No special maintenance for the shims themselves; follow your OEM maintenance schedule for valve clearance inspection intervals and re‑shim as needed.
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