K&N Custom Air Filter Assemblies for Harley Davidson Motorcycles

The latest addition to K&N's RK Series was developed to get more horsepower from your Twin Cam® Harley-Davidson® engine. Built around the legendary K&N High-Flow Air Filter, the new RK Series assembly includes an innovative powder coated billet aluminum back plate that eliminates external breathers and features a built-in, dyno-tuned velocity stack. The result is a significant airflow increase to the engine without sacrificing filtration. This RK Series assembly retains a factory appearance by utilizing the stock air cleaner cover.

• Powder Coated Billet Aluminum Backplate Eliminates External Breathers

• Features a Built-In Dyno-Tuned Velocity Stack

• Retains Factory Air Cleaner Cover

• K&N Stamped Laser-Etched Beauty Ring

• Includes Washable/Reusable K&N High-Flow Air Filter

• Does Not Fit Twin Cam® Engines with Magneti Marelli Fuel Injection System

K&N Part # RK-3909 Applications

K&N Custom Air Filter for Harley Davidson Twin Cam Motorcycles

A remarkable combination of performance and style, K&N air cleaner assemblies custom designed for your Harley-Davidson^®. Machined from billet aluminum, luster polished, then chrome plated to complement your show bike.

Two unique styles (shapes); Three unique finishes: Mirror, Ball Grooved or Flamed

These K&N custom air cleaners fit all “EVO” model Big-Twin and Sportsters with stock carburetors. Each K&N air cleaner comes complete and ready to use, including mounting bracket kit, nothing else to buy. These filters are legal only for racing vehicles. Not applicable, nor intended for use on emission controlled street or highway vehicles.

                         Air Cleaner       Filter
                         Assembly          Only          DryCharger
Style                    Part #            Part #        Part #
Teardrop “Mirror”        RK-3904           E-3333        RK-3902PK
Teardrop “Ball Grooved” RK-3914           E-3333        RK-3902PK
Teardrop “Flamed”        RK-3924           E-3333        RK-3902PK
Round “Mirror”           RK-3903           E-3336        RK-3901PK
Round “Ball Grooved”     RK-3913           E-3336        RK-3901PK
Round “Flamed”           RK-3923           E-3336        RK-3901PK

                       Assembly          Only          DryCharger
Style                  Part #            Part #        Part #
Teardrop “Mirror”       RK-3902           E-3333        RK-3902PK
Teardrop “Ball Grooved” RK-3912           E-3333        RK-3902PK
Teardrop “Flamed”       RK-3922           E-3333        RK-3902PK
Round “Mirror”          RK-3901           E-3336        RK-3901PK
Round “Ball Grooved”    RK-3911           E-3336        RK-3901PK
Round “Flamed”          RK-3921           E-3336        RK-3901PK

Height              Part No.
2 3/4"              E-3227
3 1/4"              E-3228

TAPERED FOR TWIN CAM AIR CLEANERS

5 1/2” Diameter Metal Top Plate has Centered 5/16 NC Weld Nut to
Attach Stock Cover
Top Plate is Three Hole Drilled to Fit Standard Mounting Pattern for
Twin Cam Air Cleaners
6 1/4” Diameter Molded Rubber Base

REPLACEMENT AIR CLEANER FOR SCREAMING EAGLE® ELEMENTS 29442-99A, 29442-99B, 29442-99C, and 29442-99D.

Part No. HD-0800

The K&N custom air cleaners below were designed to fit Harley-Davidson motorcycles equipped with various carburetors. These K&N air cleaners are not street legal nor recommended by Harley-Davidson Motor Co., Inc.^® The K&N custom air cleaners can increase horsepower with proper carburetor calibration. For stock K&N replacement filters to fit Harley-Davidson motorcycles, see our application search.

BENDIX-TILLOTSON Carburetors to 1975
6" Diameter Chrome Bonnet style RT-320B
Replacement element for RT-320B E-3200

Replacement Elements For Aftermarket Custom Air Cleaners

S&S "D" Teardrop housing   E-3224
S&S Teardrop shaped housing   E-3225
S&S E & G Teardrop housing   E-3226
Eagle Iron Teardrop shaped housing   HD-0500
Screamin Eagle (29055-89)   HD-0600

KEIHIN AND S&S Carburetors
Excluding All S&S E And G Carburetors

5" Diameter Open Round   RK-3201
6" Diameter Chrome Bonnet   RK-320B
Replacement element for RK-3201   E-3200
This air cleaner is designed to bolt-up directly to the Keihin or S&S carburetors.

KEIHIN FLOWMASTER Carburetors
(2-5/8" mounting flange)

5" Diameter Open Round RK-3800
6" Diameter Chrome Bonnet RK-380B
Replacement element for RK-380B: RK-320E
These air cleaners clamp directly to the carburetor flange.

RevTech^®
(early to late-style 88" and 100" engines)
Early-style RevTech^® (repl. OEM 29055-89) HD-0600
Late-style RevTech^® E-4660

LINKERT Carburetors
(early 4-bolt models)

6" Diameter Chrome Bonnet RL-320B
Replacement element for RK-320B: E-3200
1/4" Taller Replacement element E-3205

MIKUNI Carburetors
36-38mm (2-7/16" mounting flange)

5" Diameter Open Round style   RC-0850
6" Diameter Chrome Bonnet style   ML-085B
Replacement element   ML-0850
4-1/2" x 7" Open Oval style   RC-1980

40-45mm (2-3/4" mounting flange)

5" Diameter Open Round style   RC-0920
6" Diameter Chrome Bonnet style   ML-092B
Replacement element   ML-0920
4-1/2" x 7" Open Oval style   RC-2000

These air cleaners clamp directly to the carburetor flange.

Style Length Flange              Part No.
Oval 6" 10° angle x 1"           RU-1230
Oval 7" 10° angle x 1"           RU-1240
Oval 9" 10° angle x 1"           RU-1260
"D" Oval 7" 10° angle x 2-1/8"   RU-1830
"D" Oval 9" 10° angle x 2-1/8"   RU-1840

These dirt track air cleaners are large by design to allow extra dirt holding capacity without restricting air flow. The new "D" shaped oval, with the long neck, permits clamping onto the velocity stack in such a manner as not to obstruct the air flow to the velocity stack. To extend the service life, add one of our new PreCharger filter wraps.

HARLEY-DAVIDSON, EVOLUTION, SCREAMIN¹ EAGLE and TWIN CAM are trademarks of Harley-Davidson. EVO is a commonly used abbreviation of or reference to the Harley-Davidson EVOLUTION trademark. Photographs of Harley-Davidson motorcycles are included solely to demonstrate that the advertised K&N products are designed to fit such motorcycles and to demonstrate the appearance of K&N products and/or stickers applied to Harley-Davidson motorcycles. No sponsorship or endorsement by Harley-Davidson nor affiliation between K&N and Harley-Davidson is expressed or implied by anything contained herein.

These filters are legal ONLY for racing vehicles. Not applicable, nor intended for use
on emission controlled street or highway vehicles.

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	K&N Custom Air Cleaners for Harley-Davidson^® Motorcycles