KPMI Powdered Metal 54.1mm Valve Seat - Harley Evolution Big Twin & Sportster
About KPMI
Kibblewhite Precision Machining supplies valves, valve springs, guides and complete top-end kits used by professional V-twin engine builders. Its black diamond valves and spring kits are a standard specification on high-lift cam builds.
Upgrade your Harley Evolution Big Twin or Sportster with a KPMI powdered metal valve seat, engineered for superior performance and longevity. This 54.1mm valve seat is made from Kibblewhite's proprietary material, known for its exceptional resistance to microwelding and seat recession. It's built to withstand the demands of various fuel types, including ethanol blends.
Why riders pick this
- Proprietary powdered metal compound
- Compatible with all common fuel types, including ethanol
- Resists microwelding and valve face recession
- Generous leading-edge radius for simplified installation
- Maintains thermal stability under performance conditions
- Designed for Harley Evolution Big Twin and Sportster engines
When rebuilding or upgrading your Harley Evolution Big Twin or Sportster engine, the quality of your valve seats directly impacts performance and durability. KPMI valve seats, crafted from a unique powdered metal compound, offer excellent thermal stability and wear resistance. This 54.1mm seat is crucial for maintaining valve train integrity under high temperatures and pressures, ensuring consistent engine output.
Advanced Material for V-Twin Engines
- Kibblewhite's proprietary powdered metal compound
- Compatible with leaded, unleaded, methanol, and ethanol fuels
- Resists microwelding and valve face recession for extended life
- Features a generous radius on the leading edge for easier installation
- Provides thermal stability essential for street and performance riding
Reliable Performance for Your EVO
Choosing the right components for your Evolution engine is key to unlocking its full potential and ensuring its longevity. These KPMI valve seats are designed to deliver reliable performance, whether you're cruising or pushing your bike hard. They are a critical upgrade for any EVO Big Twin or Sportster owner looking to enhance their engine's durability and compatibility with modern fuel formulations. Always confirm the correct size for your specific cylinder head before installation.
Specifications
- Brand: KPMI
- Manufacturer Part #: 10-SC541
- Diameter: 54.1 mm
- Length: 3.6 in
- Width: 2.3 in
- Height: 0.85 in
- Weight: 0.15 lbs
Common questions
Will this valve seat work with ethanol fuel?
Yes, Kibblewhite's proprietary material is fully compatible with ethanol and methanol fuel blends, as well as standard leaded and unleaded gasoline.
Does this fit my 2000 or newer Sportster?
No, this particular valve seat is designed for 1984–1999 Evolution Big Twin and Sportster engines. 2000 and newer Sportsters use a different valve seat specification.
What is the benefit of powdered metal valve seats?
Powdered metal valve seats offer superior resistance to wear, microwelding, and recession, especially in high-temperature environments and with varied fuel types, leading to longer engine life.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | KPMI |
| TYPE | Engine |
| SKU | 191-57095 |
| WEIGHT | 0.15 lb |
