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Sportster Motorcycle Air intake, Carburetor, EFI, Fuel, and Exhaust Problems, advice and/or how tos for Sporster and Buell motorcycle carburators, Electronic Fuel Injection (EFI), Air Intake, Fuel and Exhaust.

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  #1  
Old 21st July 2019
Ellar Ellar is offline
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Default K&N Red Air Filter Oil Coloration Disappearing

I bought and installed a Joker Machine HP air cleaner with a K&N 4" round filter to help solve knee/shin clearance issues. I was on a ride a month or two later and happened to look down and notice my filter element was totally gray. I washed and oiled the filter that weekend and a pretty impressive amount of brown water came out. I figured the filter had caught so much stuff that it had been coated with gray dust.

Four days later I looked down and noticed all of the red indicator is gone again. Is this normal? Is the oil still in the gauze beneath the surface? Not really digging the idea of re-oiling this thing every four days.
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  #2  
Old 21st July 2019
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Once a K&N starts trapping dirt, they don't stay red. On cars, you're supposed to be able to go 50K miles before cleaning and re-oiling. On my bike, I clean it once a year, it's usually black/gray. K&N claims that the dirtier it is, the better it works and suggest cleaning it every 30K-50K miles.
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  #3  
Old 28th July 2019
Ellar Ellar is offline
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Default

Thank you!
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Old 23rd February 2021
Wiktor Wiktor is offline
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Default

I called K&N a couple years ago about that and they also told me that the red dye is not UV resistant and loses its color. Shouldn’t have happened that fast though! I think the smaller filters also lose their color due to picking up dust faster because they’re sucking a lot of air through a smaller area.
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  #5  
Old 23rd February 2021
Tomcatt Tomcatt is offline
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The red coloring helps you oil the filter evenly. Nothing more.
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  #6  
Old 23rd February 2021
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Red matters...
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Old 23rd February 2021
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rejeanprimeau rejeanprimeau is offline
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I have red dyes for liquid penetrant inspection, 20$ a can Call Ardrox for 906 and tell them I send you. LOL
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