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R-0990
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K&N R-0990 Universal Clamp-On Air Filter

Universal Air Filters > Universal Clamp-On Air Filter
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   5.0 out of 5 stars   8 Customer Reviews
  • Designed to increase horsepower and acceleration
  • Hundreds of sizes and shapes for most applications
  • High air flow with excellent filtration
  • Clamp-on washable and reusable air filter
  • Malleable flanges
  • One year limited warranty
The K&N R-0990 Universal Clamp-On Air Filter fits some Norton Commando 750, Norton Commando 850, Triumph 2500, and Triumph TR6 models. See vehicle applications link for details.
K&N's Universal Air Filters are designed and manufactured for a wide variety of applications including racing vehicles, radio-controlled cars, generators, snowmobiles, tractors, and other applications. Regardless of the angle or offset diameter of the air intake, there is probably a K&N Universal air filter for your equipment. All filters are constructed with ultra-strong molded pliable rubber flanges which absorb vibration and allow for secure attachment and can also be stretched for up to 1/16 of an inch (1.5mm) to fit in-between sizes. K&N universal air filters are washable and reusable. When used as a replacement for the OEM air filter, modifications to the jetting may be required.

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Available Information

Product Specifications

Filter MaterialCotton Gauze
Flange Angle10 degrees
Flange Center to Center2.625 in (67 mm)
Flange Inside Diameter1.875 in (48 mm)
Flange Length0.625 in (16 mm)
Flange TypeOffset
Height3 in (76 mm)
Outside Length6.125 in (156 mm)
Outside Width3.875 in (98 mm)
Top StyleRubber
Top MaterialNone
Air Filter ShapeOval
Flanges2
Package Contents1 Air Filter
Package Quantity1
Warranty12 Months
Product StyleDual Flange Oval Universal Air Filter
Flange Offset0.375 in (10 mm)
Base Outside Length6.125 in (156 mm)
Base Outside Width3.875 in (98 mm)
Top Outside Length6.125 in (156 mm)
Top Outside Width3.875 in (98 mm)
Weight1 lb (0.5 kg)
Filter Re-Oiling Amount0.57 oz (17 ml)
Product Box Height7.25 in (184 mm)
Product Box Length4.63 in (117 mm)
Product Box Width4.63 in (117 mm)
Footnote 1Base Has 13/64" Vent

K&N R-0990 Universal Clamp-On Air Filter Product Reviews

Wednesday, May 17, 2017 - Part R-0990
I ordered a set of R-0990 filters for my Triumph TR6 to improve the Injection systems air intake and am very pleased with the results, the car runs very well and the engine is much more responsive. I was very pleased with the help received on the telephone by each member of the staff in the office. The service was excellent and the order arrived the next day as promised. Thank You!

Donald Streatfield
West Byfleet, United Kingdom
Friday, January 27, 2017 - Part R-0990
Tres bon service et rapide.

Denis Boisvert
Lévis, Canada
Wednesday, October 12, 2016 - Part R-0990
An excellent after market filter for my commando, sent very quickly.

L. Noble
Wiltshire, United Kingdom