Moroso Air/Oil Separator Black - Twin Cam with Vance & Hines VO2 Air Cleaner - Harley-Davidson
About Moroso
Moroso has manufactured racing components in Connecticut since 1968, supplying engine, chassis and shop products developed through motorsport.
This black Moroso Air/Oil Separator is specifically designed for Twin Cam Harley-Davidson engines that are already running Vance & Hines VO2 air cleaners. It effectively filters crankcase vapors, oil mist, and condensation, preventing them from re-entering your intake system.
Why riders pick this
- Designed for Twin Cam with Vance & Hines VO2 air cleaners
- Filters crankcase vapors and oil mist for cleaner intake
- Sleek black finish blends with engine aesthetics
- Two-piece body unscrews for easy maintenance
- Closed-loop design keeps oil contained, off the bike
Keep your Twin Cam engine running cleaner and more efficiently with this Moroso Air/Oil Separator. By capturing harmful contaminants like oil and carbon before they can reach your intake, this system helps protect your air filter, throttle body, pistons, and valves from buildup. This translates to a more consistent power delivery and extended component life for your Harley-Davidson.
Optimized for Vance & Hines VO2 Air Cleaners
- Filters crankcase vapors, exhaust vapors, residual oil, and moisture
- Two-piece body unscrews easily for quick cleaning and service
- Does not vent to atmosphere—contains oil within the canister, off your bike and the ground
- Reduces detonation and knock by ensuring a cleaner air charge
- Proudly made in the U.S.A.
A Clean Engine is a Happy Engine
For riders who've already upgraded their Twin Cam with a Vance & Hines VO2 air cleaner, this black Moroso Air/Oil Separator is the ideal complement. It ensures that the enhanced airflow provided by your V&H intake isn't compromised by dirty crankcase gasses. Invest in this separator for a cleaner engine, improved performance, and peace of mind on every ride.
Specifications
- Brand: Moroso
- Manufacturer Part #: 85717
- UPC: 84663857171
- Length: 9 in
- Width: 6 in
- Height: 5 in
- Weight: 2 lbs
Common questions
How do I clean the separator?
The two-piece body unscrews easily without special tools. Simply empty the collected vapors and oil, rinse, and reassemble. We recommend checking it periodically, such as during oil changes.
Does this vent excess oil to the atmosphere?
No — unlike some breather kits, the Moroso system features a closed-loop design that contains all vapors and oil within the canister, preventing them from being vented to the atmosphere and keeping your bike clean.
Is this a difficult installation?
This air/oil separator is designed to plumb inline with your existing Vance & Hines VO2 air cleaner setup. While exact steps may vary, it's generally a straightforward installation for those comfortable with basic hand tools.
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 | Moroso |
| TYPE | Intake/Carb/Fuel System |
| SKU | 82-9503 |
| WEIGHT | 2.0 lb |
