KPMI Black Diamond Exhaust Valve - Harley 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.
The KPMI Black Diamond exhaust valve for Harley Sportster engines is built to enhance the longevity and performance of your bike's top end. Crafted from forged stainless steel, this valve is designed to endure the demands of aggressive riding.
Why riders pick this
- German Black Diamond® impregnation process
- One-piece forged stainless steel
- Superior wear and corrosion resistance
- Optimized flow profile for performance
- Lightweight construction for reduced inertia
For Sportster riders pushing their limits, a strong valve train is non-negotiable. This KPMI Black Diamond exhaust valve provides a significant upgrade, offering superior wear resistance and a lighter, more durable construction. The German Black Diamond impregnation process ensures the valve surface is hardened deep, protecting against friction and corrosion far better than conventional plating.
Enhanced Durability for Sportster Engines
- German Black Diamond® impregnation process for exceptional surface hardness
- One-piece forged stainless steel construction for increased strength
- Superior wear and corrosion resistance over standard valves
- Optimized flow profile to improve exhaust gas scavenging
- Lightweight design to reduce valve train inertia
Invest in Your Sportster's Performance
Whether you're doing a routine rebuild or chasing more power, upgrading to KPMI Black Diamond exhaust valves is a smart move. They provide the reliability needed for spirited riding and extended engine life, making them an essential component for any serious Sportster build. Always verify fitment with your specific model year before making a purchase.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-4197
- Length: 7.12 in
- Width: 3.5 in
- Height: 1.3 in
- Weight: 0.17 lbs
Common questions
What is the Black Diamond® process?
The Black Diamond® process is a German impregnation technique that hardens the valve surface to a depth of .002 inches, providing superior wear resistance and friction reduction compared to traditional plating methods.
Is this exhaust valve a direct replacement for my Sportster?
This KPMI Black Diamond exhaust valve is designed for Harley Sportster models from 1957-1969. Please confirm compatibility with your specific year and model before ordering.
Will installing this valve change my exhaust sound?
Replacing an exhaust valve primarily impacts engine performance and durability, not exhaust sound. Exhaust sound is primarily determined by your muffler and header design.
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 | 191-17015 |
| WEIGHT | 0.17 lb |
