K&N SU-4000 Air Filter

Replacement Filters / Replacement Air Filter
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$54.99 USD
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Product Overview

  • Designed to provide increased horsepower and acceleration
  • Specifically developed for Off-Road, Motocross, ATVs, UTVs and Side by Sides
  • Pleated cotton media provides a large filtration area offering low restriction, high-capacity and long service intervals
  • Multiple layers of woven cotton gauze media offers excellent filtration
  • Fits directly into OEM air box with application specific sealing bead ensuring a precise fit
  • No fuel management modifications are required to obtain increased performance
  • Washable & reusable, most are pre-oiled and ready to ride!
  • One Year Limited Warranty
The K&N SU-4000 Air Filter fits some Kawasaki KLX400R, Kawasaki KLX400SR, Suzuki DRZ400, Suzuki DRZ400E, Suzuki DRZ400S, and Suzuki DRZ400SM models. See vehicle applications link for details.
K&N off-road replacement air filters are ideal for extended use in dirty and dusty off-road riding and provide clean carburetion even at high altitude. Generally, no jet changes are required with just a K&N filter element. K&N replacement air filters are washable and reusable and provide high air-flow with excellent filtration.

[More Information on Off-Road Motorcycle and ATV Air Filters]
Air Filter ShapeTapered Conical
Base Inside Diameter5.125 in (130 mm)
Base Outside Diameter6.313 in (160 mm)
Filter MaterialCotton Gauze
Height3 in (76 mm)
Inner WireNo
Top Outside Diameter5.438 in (138 mm)
Top StyleRubber
Top MaterialNone
Package Contents1 Air Filter, 1 K&N 1oz Sealing Grease
Package Quantity1
Warranty12 Months
Product StyleTapered Conical Air Filter
Weight1.1 lb (0.5 kg)
Filter Re-Oiling Amount0.64 oz (19 ml)
Air Filter Large End Diameter6.313 in (160 mm)
Product Box Height8.63 in (219 mm)
Product Box Length8.5 in (216 mm)
Product Box Width3.63 in (92 mm)
WARNING: Cancer and reproductive

K&N SU-4000 Air Filter Product Reviews

Monday, June 12, 2017 - Part SU-4000
This filter is amazing! It's perfect for my 2017 DRZ 400sm.

William Belanger
Calgary, Canada
Monday, February 27, 2017 - Part SU-4000
I found out my stock foam air filter had started to disintegrate. From what I could find K&N was the only company that made a filter for my dr400 that wasn't made out of foam, so I ordered one. It seems to fit good.

George Nordquist
Banning, California
Thursday, November 10, 2016 - Part SU-4000
Great filter, have installed K&N filters on many of our vehicles, from motorcycles to trucks. Never any problems. Saved a lot of money.

Robert W. Thieme
Clymer, New York