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K&N AIR FILTER RK-3931 REPLACEMENT RK SERIES KITS | 793931
$255.99 USD
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Keep your CFMOTO performing at its best with this complete OEM oil change kit — designed for a precise fit, clean installation, and long-lasting protection.

OEM Geniune Parts
OEM Geniune Parts
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  • Developed around an oversized K&N High-Flow Air Filter that is designed to boost performance, filtration and service intervals
  • Dyno-tuned velocity stack directs airflow to engine
  • Aluminum backing plate provides solid mounting surface
  • Built-in breathers replace external OE breathers

Fitment

  • 2008 Harley Davidson FXDSE CVO Dyna
  • 2008, 2010-17 Harley Davidson FXDWG Dyna Wide Glide
  • 2008-09, 2014-17 Harley Davidson FXDL Dyna Low Rider
  • 2008-10 Harley Davidson FXD Dyna Super Glide
  • 2008-14 Harley Davidson FXDC Dyna Super Glide Custom
  • 2008-17 Harley Davidson FXDB Dyna Street Bob / FXDF Dyna Fat Bob
  • 2012-16 Harley Davidson FLD Dyna Switchback
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Frequently asked questions

How often should I replace my air or oil filter?

Most ATV, UTV, and motorcycle filters should be replaced every 50–100 hours, or sooner if you ride in dusty, muddy, or sandy conditions.

How do I know which filter fits my machine?

Use your year, make, and model, or check the OEM part number. Installing the wrong filter can restrict airflow or reduce oil pressure.

Should I choose OEM or aftermarket filters?

OEM filters provide exact fit and reliability. Aftermarket filters can improve airflow or offer budget-friendly options. Both are safe as long as they match your model.

What happens if I don’t change a clogged air filter?

A dirty air filter can cause loss of power, poor throttle response, increased fuel usage, and long-term engine wear.

Do performance filters help with power?

High-flow filters can improve airflow and slightly increase horsepower, especially on performance ATVs and motorcycles, but regular OEM filters provide the best long-term protection.