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

Moroso air-oil separator for Twin Cam Harley-Davidson engines with stock air cleaner, designed to filter crankcase vapors, oil mist, and condensation before they re-enter the intake system. Keeps your air filter, throttle body, intake, pistons, and valves free of excessive oil and carbon buildup while venting collected oils back into the crankcase rather than to atmosphere.

Features

• Filters excess crankcase vapors, fuel residue, and moisture from breather system
• Two-piece body unscrews for easy cleaning and service
• Closed-loop design — collects oil in canister instead of venting to atmosphere
• Reduces detonation and knock from contaminated intake charge
• Proudly made in the U.S.A.

Specifications

• Brand: Moroso
• Manufacturer Part #: 85714
• UPC: 84663857140
• Length: 9 in
• Width: 6 in
• Height: 5 in
• Weight: 2 lbs

Fitment

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

Frequently Asked Questions

Will this fit my Twin Cam Harley?

Yes — designed for Twin Cam engines with stock air cleaner. Not compatible with aftermarket air intake systems.

How often do I need to clean it?

Service intervals depend on riding conditions. The two-piece design allows you to unscrew and inspect the canister regularly and empty collected oil.

Does this vent oil to the ground?

No — unlike some competitor systems, the Moroso design is closed-loop. Oil collects inside the canister and is retained on the bike.

Will this improve my bike's performance?

By keeping clean air entering the intake and reducing carbon deposits on valves and pistons, it can improve throttle response and reduce detonation.

What's included?

The two-piece air-oil separator canister with all necessary hoses and fittings to plumb into your breather system.