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Travellers' questions that don't fit anywhere else This is an opportunity to ask any question, and post any notice you wish that doesn't fit into one of the other sections.
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Old 8 Apr 2003
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Fitting a foam air filter

After a lot of searching and investigation I have finally found an air filter supplier (Moto Air) that makes foam air filters to fit the Honda Transalp. The standard paper filter that the bike uses is cylindrical with a larger diameter metal plate attached at one end which serves to cover the hole in the airbox where the filter goes in and has screw holes so the plate can be screwed to the airbox thus holding the filter in place. The foam filter I have bought is simply a hollow cylindrical piece of foam, with no metal plate attached so on it's own, once it is in the airbox there is nothing holding it there and the hole in the airbox where it goes in is not covered. Now, as it happens, it fits perfectly around the original paper filter (the hole down the centre of the foam filter is exactly the same diameter as the paper filter). This would solve the problem of covering the hole in the airbox and holding the filter in place, BUT would this double layer of filtration cause performance issues? It would mean the air would first have to travel through the oiled foam filter and then through the paper filter - admittedly it would be very clean air by the time it got through, but would there be enough of it?! Anyone else come across this problem with foam filters? Or any suggestions/advice?

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Old 8 Apr 2003
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Join Date: Jul 2001
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Hello
I am working with the samme project on my AT. I have been directed to this link http://www.universal.nl/users/Africa_twin/0000201E.HTM
I know there is an site with an similar solution on an Dominator. I used an Dremel multi tool to grind away all the paper and glue. A lot of mess.
Then fitting a aproriate sized foam air filter should be easy. I have not done it yet. Maybe you could do something similar? If you are unsure if the air filter seal of the top and the botom, you can put some grease on around it.

God luck
Frode


Quote:
Originally posted by PaulJ:
After a lot of searching and investigation I have finally found an air filter supplier (Moto Air) that makes foam air filters to fit the Honda Transalp. The standard paper filter that the bike uses is cylindrical with a larger diameter metal plate attached at one end which serves to cover the hole in the airbox where the filter goes in and has screw holes so the plate can be screwed to the airbox thus holding the filter in place. The foam filter I have bought is simply a hollow cylindrical piece of foam, with no metal plate attached so on it's own, once it is in the airbox there is nothing holding it there and the hole in the airbox where it goes in is not covered. Now, as it happens, it fits perfectly around the original paper filter (the hole down the centre of the foam filter is exactly the same diameter as the paper filter). This would solve the problem of covering the hole in the airbox and holding the filter in place, BUT would this double layer of filtration cause performance issues? It would mean the air would first have to travel through the oiled foam filter and then through the paper filter - admittedly it would be very clean air by the time it got through, but would there be enough of it?! Anyone else come across this problem with foam filters? Or any suggestions/advice?

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Old 10 Apr 2003
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Thanks Frode. I did have a old paper air filter which I have now stripped the paper off. You are right there is a lot of left over paper and glue at the top and the bottom but I don't have a elctric tool to sand it off. It seems pretty solid though so I might just leave it as it is. The foam filter fits nicely over the remaining metal cage.

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