K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils, Wrench Off Nut: Fits Select Harley Davidson Motorcycles, KN-171B

K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils, Wrench Off Nut: Fits Select Harley Davidson Motorcycles, KN-171B

Q: Amazon needs to fix the fact that this filter does in fact, fit a 2018 harley davidson fat bob fxfb... cuz i use it all the time.

You can go the K&N webpage (link below) for this particular filter. There is a fitment guide there. According to that website this will fit a 2010 Fat Bob and several others.

Q: does this filter a kn171b replace a 63798-99A

The 63798-99A would cross-reference to the K&N KN-171B Oil Filter.

Q: Can I use this filter on my 2019 fatboy 107?

Not sure. A 2002 Lexus 300 SUV is the same filter as this I do know.

Q: Will this work on a2016 wide glide 103 engine

This fit the 103 Harley Twin I have. Ultimately, put your make and model into your garage in Amazon and it will let you know if it applies. I suspect it will fit all 103 engines.

Product ID: 3981525

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Details

Brand
K&N
Product Grade
Performance
Vehicle Service Type
Motorcycle
Item dimensions L x W x H
4 x 3 x 3
Outside Diameter
2.91 Inches

🔧Wrench-Off nut for effortless removal

⚙️High flow rates for peak engine performance

🛡️Pleated synthetic-blend media traps harmful contaminants

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K&N Motorcycle Oil Filter: High Performance, Premium, Designed to be used with Synthetic or Conventional Oils, Wrench Off Nut: Fits Select Harely Davidson Motorcycles, KN-171B

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Description

🛵 Ride Clean, Ride Mean: Premium Filtration for Your Harley’s Heart

TESTED TRUSTED - Laboratory-tested burst strength and capacity backed by a 1-year limited warranty—ride with confidence.
UNMATCHED FLOW EFFICIENCY - Engineered for exceptional oil flow to maximize your Harley's power and longevity.
UNIVERSAL OIL COMPATIBILITY - Seamlessly works with synthetic, conventional, and blended oils—flexibility that fits your lifestyle.
DURABILITY MEETS CONVENIENCE - Heavy-duty canister paired with a wrench-off nut ensures rugged reliability and hassle-free maintenance.
ADVANCED FILTRATION TECHNOLOGY - Synthetic-blend media captures the nastiest contaminants, protecting your engine’s heart.

The K&N KN-171B Motorcycle Oil Filter delivers high flow rates and superior filtration using pleated synthetic-blend media, compatible with all oil types. Designed specifically for select Harley Davidson models, it features a heavy-duty canister and a wrench-off nut for easy removal. Laboratory tested for durability and backed by a 1-year warranty, this filter supports longer service intervals and ensures your engine stays protected under demanding conditions.

Specifications

Brand	K&N
Product Grade	Performance Part
Vehicle Service Type	Motorcycle
Item dimensions L x W x H	4 x 3 x 3 inches
Outside Diameter	2.91 Inches
Thread Size	M17 x 1.5
Item Weight	0.6 Pounds
OEM Part Number	KN-171B
Global Trade Identification Number	00024844087737
Manufacturer	K&N Engineering
Number of Items	1
Automotive Fit Type	Vehicle Specific Fit
UPC	759173941725 182683047043 024844087737
Model	Oil Filter
Item Weight	9.6 ounces
Product Dimensions	4 x 3 x 3 inches
Item model number	KN-171B
Is Discontinued By Manufacturer	Yes
Exterior	Other
Manufacturer Part Number	KN-171B
Safety Rating	Não Aplicável

Have a Question? See What Others Asked

Amazon needs to fix the fact that this filter does in fact, fit a 2018 harley davidson fat bob fxfb... cuz i use it all the time.

does this filter a kn171b replace a 63798-99A

Can I use this filter on my 2019 fatboy 107?

Will this work on a2016 wide glide 103 engine

Reviews

R**L

Oil filter for Harley.

Are installed and no issues!

18.08.2025

J**N

High quality, good price.

Use in my M8 Roadglide. Works great.

26.09.2025

T**G

Fits 18-23 Harley m8 engines easy on/off Good quality filter

K&N quality filter. Fits all Harley m8 engine 2018-2023 m8 engine. I change every season or 3-4k mi on HD

1.06.2025

S**R

Good fit. Good quality.

Fits my 2009 Road King

27.08.2025

T**S

Great Filter and Great Price

Only filters I use. I’ve got a Street Glide and a Night Train and both have the trusted K&N brand filters. The built in nut on the filter makes it super easy to add and remove.

14.04.2025

B**R

fit perfectly

2014 dina that I have this perfectly worked great, it’s a little smaller than the stock one, but it worked fine. Took a little less oil.

15.09.2025

B**R

K&N

K&NPerfect for 2015 Harley xl1200 Forty-eightCan remove with socket, much easier to install and remove. Will buy again

9.07.2025

M**L

Good replacement

Replacement for Harley

11.09.2025

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