How Dirty is your Air Filter


Information and questions on GL1100 Goldwings (1980-1983)
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Aussie81Interstate
Posts: 679
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

How Dirty is your Air Filter

Postby Aussie81Interstate » Sun Dec 28, 2014 9:30 pm



I ordered two air filters from Taipei, at a total cost of $40AU I couldn't pass the offer up - even if they only last 10,000 kms' it is a lot cheaper than buying genuine.

Thought I would show you some pictures comparing the new and old - tell me whether it was needing a change or not - I'm embarrassed to show the state of this filter- might not have been changed in a while :lol:
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HawkeyeGL1200
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Location: Courtland, Va.
Motorcycle: 1984 GL1200 Interstate
1981 GL1100 Interstate

Re: How Dirty is your Air Filter

Postby HawkeyeGL1200 » Sun Dec 28, 2014 11:05 pm

I know they way the filter looks is the only means we have of determining how dirty it is, but it may not mean it's as dirty as we think ... if that makes any sense.

One thing I've learned is, looks can be deceiving where filters and oil are concerned.. If I had a new one in one hand, and saw that old one on my bike, I'd have changed it too. I buy new ones in groups of six and change them when I think of it.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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Aussie81Interstate
Posts: 679
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: How Dirty is your Air Filter

Postby Aussie81Interstate » Mon Dec 29, 2014 5:54 am

Hawkeye,

I thought it was due to be changed as soon as I looked at it. Unknown when changed last -so at this point in time I will have a reference as to when it was done going forward. It helps eliminate future problems and maintenance issues, or questions as to why the mileage may not be that good etc.

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WingAdmin
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Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: How Dirty is your Air Filter

Postby WingAdmin » Fri Jan 02, 2015 2:19 pm

Aussie81Interstate wrote:Hawkeye,

I thought it was due to be changed as soon as I looked at it. Unknown when changed last -so at this point in time I will have a reference as to when it was done going forward. It helps eliminate future problems and maintenance issues, or questions as to why the mileage may not be that good etc.


The only real way to tell how dirty a filter is, is to measure the vacuum inside the plenum at idle. Do it with the old filter, then measure it again with a new filter. The difference (i.e. drop in vacuum) shows how much more blocked the old, dirty filter was.




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