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Went to inspect my air filter today and it was totally dried out and mostly disintegrated, my bad for not looking at it more frequently. The metal screen behind it was partially clogged up and I vacuumed all the dried foam off it and cleaned it up.
A replacement for a new one, basically a small thin sheet of foam cut to size, from an aftermarket vendor on either of the two auction sites is $7.50.
While I don't violently object to paying an exorbitant price for something worth maybe $0.50, I really don't want to wait a week or more until it ships and arrives at my house as I want to ride the bike, and the price from the nearest dealer is over twice that which is ridiculous for what it is.
Has anyone tried to use a ScotchBrite pad or similar? They come in different grades/colors, and I would use a fine one so as to catch more dirt. Maybe even two layers thick. Seems to me that would last a looong time compared to foam and could be easily cut to fit and oiled up just the same as a foam sheet air filter.
Let me know what you think, if positive, I may try it and see how it works.
 

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I try to keep the intake and exhaust systems stock if possible. One little change can sometimes change the performance or starting characteristics and not always for the better, IMO.
 

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I sure have thought about putting a Briggs and Stratton air filter in the square hole under the seat. They seem to last forever and they are made for really dusty environments. You can also get prefilters for them. I think getting the proper hp rated filter would be a necessity. Scotti158 brings up a good point though.
 

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Wise decision mrimd. Seems like the heat and humidity of Florida is hard on our bikes and thus frequent servicing is waranteed.
The UNI filter would have worked too, but was the last one . However installation was included at only $79.20.;)
 

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Looks to be OEM. I might also recommend that you try the NoToil filter oil and cleaner kit. The oil is extremely sticky and does not evaporate, catching even smaller particles than regular oil. The best part is that the cleaner allows you to clean the filter in a sink and air dry it, then add about three tablespoons of the oil, roll the filter to distribute, air dry 10 minutes and install. One kit will last about 5 years.

I was still using the original foam filter on my 2010 after 7 years and 16,000 miles. This product is very gentle on the foam.
 

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The stock foam is good if it's cared for properly, and $8 bucks is too much for anyone? Scotch brites will not work. Yamaha has rocket scientists who do nothing more than design proper filter material. To think that 3M can accidently improve on that to wash dishes is nutts. (a make shift holdover fix at best) Any grit that gets by is like sandpaper in a engine turning up to 9500 rpms. Precision machinery don't take well to grit.
 

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I would fear a false economy attempting any substitute since money saved for a correct filter would not begin to cover costs for just the gaskets needed in an engine re-build should substitute foam not do its intended job.
i.e. it might work, but why run the risk? Putting the foam under your seat for greater comfort might be a better use for the salvaged reticulated foam.:)
 

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it is just an accident waiting to happen. do not I mean do not use scotch bride as an air filter it will only stop twigs and bugs but it will not stop all particles which will wear out your carburetor and your hole opened valves cylinder, everything! if I were you I would just go to home depot and buy a sprung sheet and cut it out as an air filter. afterwards, oil it with any thick oil (do not use old oil) I personally use 90w gear oil and I use it to lube my chain. anyway best of luck to you all out there
 

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The foam part of any air filter is just there to hold the oil. The oil is what captures the dirt. Always use a good oil on the foam. Never ever put the foam on without the oil. "Filter" oils are the best but whatever oil you use in the engine will be fine also.
 
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