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200,000+ Parts & Accessories Our catalogue has grown extensively over the years and we now source a huge range of parts and accessories from a number of distributors from round the world.
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Simple Exchange Or Refund Policy
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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 this 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. The RK-3910-1 comes with a larger air filter and longer spacers than the RK-3909-1. Installation Instruction Sheet included, see notes for information.
Product Information:
Designed to increase horsepower & torque
Dyno-tuned velocity stack
Washable and reusable
Excellent air filtration
Product Specifications:
Cotton Gauze Material
Red Air Filter Colour
1.625 in (41 mm) Height
2.25 in (57 mm) Neck Flange
2.25 in (57 mm) Inlet Diameter
Part numbers +
rk-3910-1
681973
900336
Fitment +
HARLEY DAVIDSON
Dyna Switchback - FLD: 2012-2016
Road King - FLHR: 1999-2016
Road King Classic - FLHRC: 2004, 2007-2016
Road King Classic (EFI) - FLHRCI: 1999-2006
Road King (EFI) - FLHRI: 1999-2006
Road King Custom - FLHRS: 2004-2007
Road King CVO/SE - FLHRSE3: 2007
Road King CVO/SE - FLHRSE4: 2008
Road King CVO/SE - FLHRSE5: 2013
Road King CVO/SE - FLHRSE6: 2014
Road King CVO/SE (EFI) - FLHRSEI: 2002
Road King CVO/SE (EFI) - FLHRSEI2: 2003
Road King Custom - FLHRSI: 2004-2006
Electra Glide Standard - FLHT: 1999-2005, 2007-2010
Softail Breakout Pro Street CVO/SE - FXSE: 2016-2017
Softail - FXST: 2000-2007
Softail Night Train - FXSTB: 2000-2009
Softail Night Train (EFI) - FXSTBI: 2003-2006
Softail Custom - FXSTC: 2007-2010
Softail Deuce - FXSTD: 2000-2007
Softail Deuce (EFI) - FXSTDI: 2001-2006
Softail Deuce CVO/SE - FXSTDSE: 2003
Softail Deuce CVO/SE - FXSTDSE2: 2004
Softail Standard (EFI) - FXSTI: 2003-2006
Softail Springer - FXSTS: 2000-2006
Softail Springer (EFI) - FXSTSI: 2003-2006
Softail Springer CVO/SE - FXSTSSE: 2007
Softail Springer CVO/SE - FXSTSSE2: 2008
Softail Springer CVO/SE - FXSTSSE3: 2009
Delivery +
All orders are shipped with either DPD, Fedex, UPS, DHL or Royal Mail. The courier used to ship your order is determined by ourselves once your order has been placed and normally depends on the size, volume and the shipping destination. The selected courier for your order will be quoted in your order confirmation email which you will receive once we have processed your order. Once your order has been shipped, this will be confirmed via email and you will receive a tracking number so you can keep an eye on your shipments progress.
Estimated shipping date between 30 Dec and 3 Jan.
