RK-3902 - K&N Custom Assemblies, Intake System-Harley Davidson direct from K&N

K&N RK-3902
Custom Assemblies > Intake System-Harley Davidson

Your Price: $270.00

Find a Local Dealer

In Stock & Ready to Ship! Free Ground Shipping!

K&N air cleaner assemblies, designed for your Harley-Davidson®, are a remarkable combination of performance and style. They are machined from billet aluminum, luster polished, then chrome plated to complement your show bike. These K&N custom air cleaners fit all touring models. Each K&N air cleaner comes complete and ready to use, including mounting bracket kit with nothing else to buy.

Available Information

Installation Instruction Sheet

RK-3902 Vehicle Applications

Part RK-3902 Product Specifications
Product Style: Motorcycle Intake System
Street Legal In All US States: No
TUV Approved (Europe): No
Air Filter Shape: Teardrop
Clamp Style: No Clamps Required
Color: Red
Filter Height: 2.188 in (56 mm)
Filter Material: Cotton Gauze
Neck Flange: 3.25 in (83 mm)
Overall Height: 2.5 in (64 mm)
Replacement Filter: E-3333
Size: 10-12
Top Material/Finish: Chrome
Top Style: Chrome
Total Height: 2.5 in (64 mm)
Weight: 4.8 lb (2.2 kg)
Product Box Length: 11.56 in (294 mm)
Product Box Width: 9.5 in (241 mm)
Product Box Height: 4.5 in (114 mm)

Accessories

99-5050 - Filter Care Service Kit - Squeeze

E-3333 - Replacement Filter

Product Reviews Review part RK-3902

Dear sirs:

All I can say is most people won't believe this but then it's their loss...in miles per gallon that is. I Own 2 Harleys, a 1979 HD Sportster that several years ago I put a K&N air filter on and felt like it doubled it's performance, and a 1999 FLSTF Fat Boy. I didn't rest there, as a year ago I put a K&N on my 2001 Dodge Ram Quad cab Cummins turbo diesel and also felt the increase in performance not to mention the scream of that turbo that I had never really heard from the factory.

Recently two of my buddies and I went on a motorcycle trip to Stecoah, N.C. Before going on the trip I changed all my fluids and serviced the whole bike. I decided to buy a K&N air filter and pitch the stock one. They were riding a 2003 Honda Goldwing, a 2005 Harley Davidson Roadking and I took my 99 Fat Boy. Prior to installing the K&N my Fat Boy got between 40 & 43 MPG. As we went from fuel stop to fuel stop my mileage was as follows: 43 MPG, 47 MPG, 46 MPG, 48 MPG and 52 MPG EVERY tank after that. My buddies only mustered 44 -46 MPG. Most people would ask what about the weight and the speed. Well both my saddle bags were packed, I had a bag with 20 lbs. on my luggage rack, plus my TBags weighed in at about 50 lbs. The weight we carried was all about the same. The motorcycle weights were different, but not enough to warrant the major difference in MPG. Also mine is carbureted and theirs are fuel injected. As far as the speeds, we were cruising on the interstate at 70 to 80 MPH through a whole fuel run which was about 200 miles. Even when I was on the tail of the dragon, which is 318 turns in 11 miles, my mileage stayed at 52 MPG. All I can say is after over 1700 miles on that trip the K&N definitely paid for itself with the increase of 9-12 MPG.

So everyone has a choice. you can pay at the pumps or spend that money on the LAST air filter you will EVER buy.
Ronnie E., Glen Rock, Pennsylvania

Coming from Southern Calif. as I do I have been a big fan of K&N air filters for a long time and today was no exception. I just finished installing the RK-3909 air cleaner/filter kit and I must say I was not only impressed with the hardware and the way everything went together and fit perfect but the step by step instructions (with photos) were great. You see writing instructions is something I know a little about as a retired aerospace Mfg. Engineer I wrote instructions for the guys making the parts as well as putting together of rockets and all types of aircraft.
2007 Harley Davidson 96ci Softail Model Nightrain
Well done and thank you,
Lee Champagne, Orcas, Washington

My 2008 Colorado Crew Cab was great - until you had to put your foot in it and pass someone. I had always heard good things about K&N and the benefits to horsepower and acceleration. The filter to fit my vehicle's 3.7 liter engine had not even been released yet, but I told my local dealer to order it as soon as it was available. The difference in performance was immediate. The acceleration is now everything that it should be, and is completely responsive to what I need it to do. I have become an advocate for K&N and recommend them anytime I get the chance. A friend didn't hesitate in taking my advice when it came to upgrading his new Harley Davidson Dyna Glide! Kudos on a job well done!!!
Gary Lewis, Memphis, Tennessee

K&N RK-3902 fits the following:

1997 HARLEY DAVIDSON FXSTSB BAD BOY 82 CI - Tear Mirrored