Moroso
Moroso manufactures high-performance motorcycle ignition components and crankcase ventilation products engineered for Harley-Davidson motorcycles. The lineup includes Suppression Core, Spiral Core, and Ultra 40 spark plug wire sets, along with air oil separators for Twin Cam and Milwaukee-Eight engines. Designed for dependable ignition performance and efficient crankcase ventilation, Moroso products support both replacement and performance applications. Popular searches include Harley spark plug wires, performance ignition wires, and Harley air oil separato
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Out of stock
Moroso - 28621 - Ign Wires Ultra 40/Set Red 78-83 Universal
Moroso
$40.95Moroso - 28621 - Ign Wires Ultra 40/Set Red 78-83 UniversalFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket to...$40.95 -
Out of stock
Moroso - 28624 - Ign Wires Ultra 40/Set Red 82-99 Fxr
Moroso
$40.95Moroso - 28624 - Ign Wires Ultra 40/Set Red 82-99 FxrFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket to...$40.95 -
Out of stock
Moroso - 28625 - Ign Wires Ultra 40/Set Red 86-03 Xl (Ex 1200S)
Moroso
$40.95Moroso - 28625 - Ign Wires Ultra 40/Set Red 86-03 Xl (Ex 1200S)FeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone...$40.95 -
Out of stock
Moroso - 28627 - Ign Wires Ultra 40/Set Red 99-17 Fxd
Moroso
$40.95Moroso - 28627 - Ign Wires Ultra 40/Set Red 99-17 FxdFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket to...$40.95 -
Out of stock
Moroso - 28628 - Ign Wires Ultra 40/Set Red 98-03 Xl 1200S
Moroso
$71.95Moroso - 28628 - Ign Wires Ultra 40/Set Red 98-03 Xl 1200SFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket to...$71.95 -
Out of stock
Moroso - 28629 - Ign Wires Ultra 40/Set Red 00-17 Softail
Moroso
$39.95Moroso - 28629 - Ign Wires Ultra 40/Set Red 00-17 SoftailFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket to...$39.95 -
Out of stock
Moroso - 28630 - Ign Wires Ultra 40/Set Red 04-06 Xl
Moroso
$39.95Moroso - 28630 - Ign Wires Ultra 40/Set Red 04-06 XlFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket to reduce...$39.95 -
Out of stock
Moroso - 28631 - Ign Wires Ultra 40/Set Red 07-19 Xl
Moroso
$39.95Moroso - 28631 - Ign Wires Ultra 40/Set Red 07-19 XlFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket to reduce...$39.95 -
Out of stock
Moroso - 28641 - Ign Wires Ultra 40/Set Red 17-Up M8 Flt
Moroso
$73.95Moroso - 28641 - Ign Wires Ultra 40/Set Red 17-Up M8 FltFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket to...$73.95 -
Out of stock
Moroso - 28640 - Ign Wires Ultra 40/Set 17-Up M8 Flt
Moroso
$73.95Moroso - 28640 - Ign Wires Ultra 40/Set 17-Up M8 FltFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket to reduce...$73.95 -
Moroso - 28644 - Ign Wires Ultra 40/Set `18-Up Softail Models
Moroso
$78.95Moroso - 28644 - Ign Wires Ultra 40/Set `18-Up Softail ModelsFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket...$78.95 -
Out of stock
Moroso - 28645 - Ign Wires Ultra 40/Set `18-Up Softail Models
Moroso
$78.95Moroso - 28645 - Ign Wires Ultra 40/Set `18-Up Softail ModelsFeaturesAll Moroso spark plug wires feature silicone plug boots that withstand high temperatures (up to 600 ), and have a silicone jacket...$78.95 -
Moroso - 85710 - Air Oil Separator V-Twin Univ. Breather
Moroso
$362.95Moroso - 85710 - Air Oil Separator V-Twin Univ. BreatherFeaturesThe Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully functional. It filters out crankcase...$362.95 -
Moroso - 85711 - Air Oil Separator V-Twin Univ. Breather
Moroso
$362.95Moroso - 85711 - Air Oil Separator V-Twin Univ. BreatherFeaturesThe Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully functional. It filters out crankcase...$362.95 -
Out of stock
Moroso - 85719 - Air Oil Separator Twin Cam W/S&S Teardrop Air Cleaner Pol
Moroso
$362.95Moroso - 85719 - Air Oil Separator Twin Cam W/S&S Teardrop Air Cleaner PolFeaturesThe Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully functional. It...$362.95 -
Out of stock
Moroso - 85713 - Air Oil Separator Twin Cam W/Stock Air Cleaner Polished
Moroso
$362.95Moroso - 85713 - Air Oil Separator Twin Cam W/Stock Air Cleaner PolishedFeaturesThe Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully functional. It filters...$362.95 -
Moroso - 85714 - Air Oil Separator Twin Cam W/Stock Air Cleaner Black
Moroso
$362.95Moroso - 85714 - Air Oil Separator Twin Cam W/Stock Air Cleaner BlackFeaturesThe Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully functional. It filters out...$362.95 -
Out of stock
Moroso - 85716 - Air Oil Separator Twin Cam W/V&H Vo2 Air Cleaner Polished
Moroso
$362.95Moroso - 85716 - Air Oil Separator Twin Cam W/V&H Vo2 Air Cleaner PolishedFeaturesThe Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully functional. It...$362.95 -
Moroso - 85717 - Air Oil Separator Twin Cam W/V&H Vo2 Air Cleaner Black
Moroso
$362.95Moroso - 85717 - Air Oil Separator Twin Cam W/V&H Vo2 Air Cleaner BlackFeaturesThe Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully functional. It filters...$362.95 -
Moroso - 85720 - Air Oil Separator Twin Cam W/S&S Teardrop Air Cleaner Bla
Moroso
$362.95Moroso - 85720 - Air Oil Separator Twin Cam W/S&S Teardrop Air Cleaner BlaFeaturesThe Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully functional. It...$362.95 -
Moroso - Polished Air Oil Separator w/ Stock & SE Air Cleaners for Harley M8 Models
Moroso
$362.95Moroso - Polished Air Oil Separator w/ Stock & SE Air Cleaners for Harley M8 Models Features The Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully...$362.95 -
Moroso - Black Air Oil Separator w/ Stock & SE Air Cleaners for Harley M8 Models
Moroso
$362.95Moroso - Black Air Oil Separator w/ Stock & SE Air Cleaners for Harley M8 Models Features The Moroso air-oil separator/catch can system keeps the H-D cylinder head breather system fully...$362.95
Moroso Performance Engine Systems – Spark Plug Wires, Air Oil Separators & Ignition Components
Moroso has earned a reputation for producing high-performance Harley ignition wires and engine components that meet the demands of riders, racers and professional builders. Designed to provide dependable spark delivery, improved electrical performance and long service life, Moroso products help optimize engine efficiency across a wide range of Harley-Davidson models. Whether upgrading an older V-Twin or enhancing a modern Milwaukee-Eight engine, Moroso components are engineered for dependable performance.
The Moroso lineup includes performance spark plug wires, spiral core spark plug wires, suppression core ignition wires, Ultra 40 ignition wire sets, air oil separators, crankcase breather systems and other motorcycle engine components. Available for Touring, Softail, Dyna, Sportster, FXR, Big Twin, Twin Cam and Milwaukee-Eight platforms, these products help improve ignition reliability, reduce electrical interference and minimize oil carryover through the engine's breather system.
Built for both performance upgrades and routine maintenance, Moroso products are trusted by enthusiasts seeking premium Harley spark plug wires, motorcycle breather systems and V-Twin performance parts. Whether you're installing an air oil separator to improve crankcase ventilation or upgrading to premium ignition wires for stronger spark delivery, Moroso provides proven solutions that enhance reliability and performance on every ride.