Moroso Air/Oil Separator - M8 W/Stock & SE AIR Cleaners Black — Harley-Davidson (2017-2020)

Moroso air-oil separator for Harley Milwaukee-Eight engines with stock or SE air cleaners, 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 clean by preventing oil and carbon buildup that stock breather systems allow back into the engine.

Features

• Filters crankcase vapors, unburnt fuel, residual oil and moisture from breather system
• Two-piece design unscrews for easy cleaning and service
• Sealed system — does not vent to atmosphere, keeping oil contained and off your bike and ground
• Reduces detonation and knock, helps eliminate intake deposits on valves and pistons
• Made in the U.S.A.

Specifications

• Brand: Moroso
• Manufacturer Part #: 85723
• UPC: 84663857232
• Length: 9 in
• Width: 6 in
• Height: 5 in
• Weight: 2 lbs

Fitment

Fits Harley-Davidson Milwaukee-Eight engines equipped with stock air cleaner or SE air cleaner.

Frequently Asked Questions

How often do I need to service this catch can?

Empty the separator and clean the two-piece body periodically depending on riding conditions. Check oil level before each ride and drain collected oil as needed.

Will this fit my Harley with an aftermarket air cleaner?

This part is designed for stock or SE air cleaners. Fitment with other aftermarket air cleaners may require verification.

Does this system vent to atmosphere?

No — the Moroso system is sealed and collects vapors in the canister. It does not vent to the atmosphere like some competitor breather kits.

Do I need to rejet or tune my engine?

No tuning required. The separator integrates inline with the stock breather system without affecting fuel mapping.

What happens to the oil it collects?

Oil and moisture collect in the two-piece canister. You drain and dispose of it properly during service — it stays off your bike and the ground.