- Almost all Harley-Davidson engines that vent the crankcase through the cylinder heads also expel oil through the same passages.
- Venting directly into the air cleaner, especially a free-flowing air cleaner, often results in an oily mess on the side of the bike.
- The banjo fittings and chrome tubes route the vented gasses upward so gravity can keep any expelled oil droplets in the engine where they belong.
- We recommend venting the crankcase to open air by running the vent line up and out of sight beneath the tank,
- An optional catch tank is available for those who would rather vent to a closed container.