KPMI Compression Releases M10 x 1 Thread - Harley Evolution
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.
KPMI compression releases, sold in pairs, are designed to reduce hot-start strain on the battery and starter motor of your Harley Evolution V-twin engine. These M10 x 1 threaded valves bleed cylinder pressure, making starting easier and more reliable.
Why riders pick this
- Reduces hot-start strain on battery and starter
- M10 x 1 thread pitch for easy installation
- Custom molded knobs for cool-touch operation
- 5-7 Newton's closing force for reliable function
- Sold in pairs for complete V-twin coverage
Dealing with stubborn hot starts on your Harley Evolution can be frustrating and hard on your starter and battery. KPMI compression releases offer a simple yet effective solution. By bleeding off a small amount of cylinder pressure before cranking, they significantly reduce the load on your starting system, leading to quicker, smoother starts. This is a must-have upgrade for any V-twin owner looking to extend the life of their electrical components and ensure reliable ignition every time.
Reliable Starting, Every Time
- M10 x 1 thread pitch for direct fitment
- Reduces strain on starter motor and battery
- Custom molded knobs for cool-touch and easy operation
- 5-7 Newton's closing force resistance for consistent performance
- Sold in pairs to cover both cylinders of a V-twin
Essential for V-Twin Longevity
These compression releases are a practical and beneficial addition, especially for higher compression Evolution engines or those operating in warmer climates. They improve the overall starting experience without affecting engine performance once running. Easy to install, this KPMI two-pack provides everything you need to upgrade both cylinders of your Harley Evolution, ensuring your bike fires up with less effort and more consistency.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-21250
- Thread Pitch: M10 x 1
- Quantity: 2 per pack
- Weight: 0.09 lbs
Common questions
What do compression releases do for my Harley Evolution engine?
Compression releases bleed off a small amount of cylinder pressure before the engine starts, significantly reducing the load on your starter motor and battery, which results in easier and more reliable starts, especially when hot.
How many compression releases are included in this pack?
This pack includes two compression releases, which is the correct quantity needed to cover both cylinders on a V-twin engine like your Harley Evolution.
Are these compression releases difficult to install?
Installation typically involves screwing the releases into the cylinder heads. While straightforward, ensure your engine is cool and consult a service manual or professional if you are unsure about the process for your specific model.
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 | 191-27050 |
| WEIGHT | 0.09 lb |
