KPMI Compression Releases - Twin Cam Harley-Davidson
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.
Reduce the strain on your starter and battery with KPMI Compression Releases, designed for Harley-Davidson Twin Cam engines. These releases vent cylinder pressure, making hot and cold starts smoother and extending the life of your electrical system. Sold as a pair, they are a direct fit upgrade for many Twin Cam platforms.
Why riders pick this
- Reduces hot-start issues and starter load
- Custom-molded knobs for cool touch and easy operation
- Engineered for Twin Cam V-twin engines
- Direct fit for M10 x 1 threaded ports
- Sold as a pair for full engine coverage
KPMI compression releases are engineered to make starting your Twin Cam V-twin easier, especially in hot conditions. By temporarily reducing cylinder pressure, they allow your starter motor to spin the engine over with less effort, protecting both your starter and battery from premature wear. Each pair features custom-molded knobs for comfortable, cool-touch operation.
Smoother Starts, Less Strain
- Reduces hot-start difficulty and starter motor load
- Custom-molded knobs for easy, cool-touch operation
- Designed for Twin Cam engines with M10 x 1 threaded ports
- Sold as a pair for complete engine coverage
Upgrade for Longevity
Installing these KPMI compression releases is a smart investment for any rider looking to improve their starting reliability and extend the life of their motorcycle's electrical components. They're a practical upgrade that pays dividends in convenience and component preservation, especially for bikes that see frequent starts or operate in varying climates. Confirm your specific model year and engine's thread pitch before ordering.
Specifications
- Brand: KPMI
- Manufacturer Part #: 20-21255
- Quantity: 2 per pack
- Thread Pitch: M10 x 1
- Weight: 0.09 lbs
Common questions
What do compression releases do for my engine?
Compression releases vent cylinder pressure during startup, which reduces the effort needed to turn the engine over. This helps prevent strain on your starter motor and battery, especially during hot starts.
How many compression releases are included?
These KPMI compression releases are sold as a pair, providing one for each cylinder of your Twin Cam engine.
Will these fit my Harley-Davidson Twin Cam?
These compression releases are designed for V-twin motorcycles with M10 x 1 threaded ports. Most Harley-Davidson Twin Cam models use this size. Please confirm your specific engine's port thread pitch before ordering using our Shop by Bike tool.
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 | 191-27051 |
| WEIGHT | 0.09 lb |
