Moroso Air/Oil Separator - Twin CAM W/Stock AIR Cleaner Polished — Harley-Davidson (1999-2017)

Moroso air-oil separator for Twin Cam Harley with stock air cleaner, designed to filter crankcase vapors, oil mist, and condensation before they re-enter the intake. Keeps your air filter, throttle body, intake, pistons, and valves free of oil and carbon buildup while maintaining the factory breather system function.

Features

• Filters crankcase vapors, unburnt fuel, residual oil and moisture from breather system
• Two-piece body unscrews for easy cleaning and service
• Closed-loop design — does not vent to atmosphere, keeping oil in the canister and off the ground
• Reduces detonation and knock by cleaning intake tract
• Made in the U.S.A.

Specifications

• Brand: Moroso
• Manufacturer Part #: 85713
• UPC: 84663857133
• Length: 9 in
• Width: 6 in
• Height: 5 in
• Weight: 2 lbs

Fitment

Fits Harley-Davidson Twin Cam engines with stock air cleaner setup.

Frequently Asked Questions

Will this fit my Twin Cam with a custom intake?

This system is designed for stock air cleaner fitment. Custom intakes may require adapter verification — contact Moroso with your specific intake part number.

How often do I need to empty or clean the separator?

The two-piece body unscrews for easy service. Cleaning frequency depends on riding conditions and engine tune — inspect every 500–1000 miles initially.

Does this vent to atmosphere like other breather kits?

No — Moroso's closed-loop design keeps separated oil in the canister, not on your bike or the ground, unlike open-vent competitors.

Will this reduce my air filter clogging?

Yes. By filtering crankcase vapors before they enter the intake, it significantly reduces oil and carbon accumulation on your filter and throttle body.

Is this made in the U.S.A.?

Yes — Moroso manufactures this separator in the U.S.A.