Moroso Air/Oil Separator - Twin CAM W/S&s Teardrop AIR Cleaner BLA — Harley-Davidson (1999-2017)

Moroso air-oil separator designed for Twin Cam Harley-Davidson engines with S&S Teardrop air cleaner, plumbs inline into the factory breather system to filter crankcase vapors, oil mist, and moisture before they enter the intake. Keeps the intake tract, valves, and pistons clean while preventing oil from venting onto your bike or the ground.

Features

• Filters crankcase vapors, residual oil, and moisture from factory breather
• Two-piece body unscrews for easy cleaning and service
• Does not vent to atmosphere — collects oil in canister instead of onto bike or ground
• Reduces detonation and knock from contaminated intake charge
• Made in the U.S.A.

Specifications

• Brand: Moroso
• Manufacturer Part #: 85720
• UPC: 84663857201
• Length: 9 in
• Width: 6 in
• Height: 5 in
• Weight: 2 lbs

Fitment

Fits Harley-Davidson Twin Cam engines equipped with an S&S Teardrop air cleaner.

Frequently Asked Questions

What's the difference between this and other catch cans?

Moroso's system does not vent excess oil to atmosphere or ground — it collects everything in the canister so you stay clean and compliant.

How often do I need to clean it?

Check and empty the separator every oil change or when it shows visible oil accumulation. The two-piece design makes service quick and simple.

Will this fit my Twin Cam with stock air cleaner?

This part is designed for S&S Teardrop air cleaner specifically. Check fitment if your bike uses a different air intake setup.

Does this affect performance?

Yes — by keeping the intake clean and reducing crankcase contamination, it helps reduce detonation and knock for more consistent power.