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Wednesday 21 July 2021


Keep It Clean with Moroso Air-Oil Separators

Exclusive to Boise, Idaho based HardDrive, the Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully functional by filtering out the crankcase vapors, oil mist and condensation that normally vent to the intake system.
This will keep the air filter, throttle body, intake, pistons and valves free of excessive oil and carbon build-up.


Headquartered near New Haven, Ct., and with a specialty ignition wire manufacturing facility in Pa., Moroso Performance Products have been manufacturing oiling systems and oil system accessories for over 50 years. One of the world's most respected suppliers of automotive equipment for racing and street performance applications, Moroso manufactures over 4,000 products, from oil pans and oiling systems to ignition wire and components, valve covers, fuel system equipment, air cleaners, hard core racing tools, chassis and suspension equipment and numerous other performance parts. The company has an impressive list of customers, ranging from grassroots racers to top level NASCAR and NHRA/IHRA race teams.
Their air-oil separator/catch can system for Harley applications is different than others on the market. It separates the vapors breathing from the engine, collecting them in their air-oil separator/catch can system while clean, filtered air (rather than contaminated air) recirculates back into the intake.

The system plumbs inline of the breather system. Once the air-oil separator system fills, it is simply drained as a service item. This can be done at oil changes and normal service intervals. The two-piece design simply unscrews for easy cleaning and service. The system does not vent into the atmosphere like other breather kits on the market - keeping the oil in the canister.
It is available with a polished or black body for most H-D Twin Cam and M-8 Touring models and works with the stock and Screamin' Eagle air cleaners and selected Vance & Hines V02 and S&S teardrop air cleaner and filter applications.
For other and custom applications (including 1991 - 2013 Sportsters), Moroso offers a universal air-oil separator for air cleaners that do not bolt to the cylinder heads, or when factory breather bolts are not used with an air cleaner backing plate.
All kits include the Moroso billet air-oil separator/catch can, mounting bracket and hardware, 6 ft of 3/8" PCV compliant breather hose, two 3/8" barbed inlet fittings and installation instructions.

Moroso also offers high performance Ultra 40 spark plug wires as a stock upgrade for selected Touring (1980 to present), Softail (1984 to present), Dyna, FXR, XL (1986 to present), Shovelhead and Street models.
WPS/HardDrive ships to its dealers in the United States from some one million plus sq ft of distribution center space at facilities in Midway, Georgia; Fresno, California; Midlothian, Texas; Ashley, Indiana; Elizabethtown, Pennsylvania and its Boise, Idaho headquarters.