Moroso Air/Oil Separator for Stock & SE Air Cleaners - Black - Harley Milwaukee-Eight
About Moroso
Moroso has manufactured racing components in Connecticut since 1968, supplying engine, chassis and shop products developed through motorsport.
The Moroso Air/Oil Separator for Milwaukee-Eight engines is a vital upgrade for maintaining a clean and efficient intake system. It's engineered to filter crankcase vapors, oil mist, and condensation, preventing these harmful elements from re-entering your engine. This ensures your air filter, throttle body, and internal engine components remain free from oil and carbon buildup.
Why riders pick this
- Filters crankcase vapors and unburnt fuel
- Prevents oil and carbon buildup on engine parts
- Sealed system contains all collected oil
- Reduces detonation and helps eliminate intake deposits
- Two-piece design for easy cleaning and service
Stock breather systems on Milwaukee-Eight engines can recirculate oil and unburnt fuel back into the intake, leading to carbon deposits on valves and pistons over time. This Moroso separator acts as a barrier, capturing these contaminants before they can impact engine performance. The result is a cleaner-running engine with less risk of detonation and improved longevity.
Enhanced Engine Cleanliness
- Filters crankcase vapors, unburnt fuel, residual oil, and moisture
- Prevents oil and carbon buildup on critical intake and engine components
- Sealed system ensures no venting to atmosphere, keeping your bike clean
- Helps eliminate intake deposits and reduces engine knock
Optimal M8 Engine Protection
Finished in black, this Moroso Air/Oil Separator integrates seamlessly with your Milwaukee-Eight, especially those running stock or Screamin' Eagle air cleaners. The two-piece design allows for straightforward disassembly and cleaning, making maintenance a breeze. By installing this separator, you're proactively safeguarding your M8 against common issues associated with factory breather systems, ensuring your performance V-twin stays strong.
Specifications
- Brand: Moroso
- Manufacturer Part #: 85723
- UPC: 84663857232
- Length: 9 in
- Width: 6 in
- Height: 5 in
- Weight: 2 lbs
Common questions
What makes this air/oil separator better than the stock breather system?
The stock system recirculates oil and vapors back into your intake, leading to carbon buildup. This Moroso separator captures those contaminants, keeping your engine cleaner and performing more efficiently.
How often do I need to clean the catch can?
Cleaning frequency depends on your riding habits and conditions. It's recommended to periodically check the canister and empty/clean it as needed to maintain optimal function.
Will this fit my Milwaukee-Eight if I have an aftermarket air cleaner?
This Moroso Air/Oil Separator is specifically designed for Milwaukee-Eight engines with stock or Screamin' Eagle (SE) air cleaners. Compatibility with other aftermarket air cleaners may vary, so please confirm before purchase.
Ordering from Vtwinbikers
- Brand new, sourced through authorized US distribution — never used, never grey-market.
- Not sure it fits? Use Shop by Bike to filter by your year and model, or email us and we will confirm before you order.
- Harley-Davidson and Indian Motorcycle is all we do, so you are talking to people who ride what you ride.
| BRAND | Moroso |
| TYPE | Intake/Carb/Fuel System |
| SKU | 82-9507 |
| WEIGHT | 2.0 lb |
