The Moroso 85712 Air-Oil Separator is a universal inline breather filtration system designed for Harley-Davidson EVO, Twin Cam, and Sportster engines from 1988-2016. By separating oil mist, condensation, and crankcase vapors before they return to the intake system, this unit helps prevent carbon buildup on pistons, valves, throttle bodies, and air filters. Its black and polished two-piece aluminum body provides a clean appearance and allows easy disassembly for routine service.

Moroso 85712 Air-Oil Separator Features:

• Designed for 1988-2016 Harley Davidson EVO, Twin Cam, and Sportster engines
• Universal inline breather filtration system for improved engine cleanliness
• Captures crankcase vapors, oil mist, exhaust vapors, and residual moisture
• Reduces detonation, knock, and intake tract deposits
• Helps prevent excessive oil contamination of air filters and intake components
• Two-piece black and polished body unscrews for easy cleaning and service
• Maintains full functionality of the OE breather system
• Does not vent to atmosphere—keeps oil contained and off the motorcycle

Moroso 85712 Air-Oil Separator Notes:

• Requires periodic draining based on riding and service intervals
• Install inline with the factory breather routing
• Universal design—verify mounting location for best fit

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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