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Mystery Neoprene In Air Filter - Any Guesses?

Discussion in 'BNS12 Chat & Tech' started by Tony D., Oct 23, 2017.

  1. Tony D.

    Tony D. Just got it firing!

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    Found my air filter plugged with disintegrated neoprene "ash" and two 3-inch long strips. Amazing the bike was able to breath and run as well as it did. The square air cleaner cover top-side neoprene (acoustic insulation?) appeared intact. Luckily the air filter did it's job with the engine side being spotless. Being new to the bike I'm puzzled of it's origin and would appreciate any insight.
    Thanks
     

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  2. canuck1969

    canuck1969 GT Reference GT Contributor

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    Looks like a foam filter. Wondering if the previous owner put a pre filter on the air intake.
     
  3. GT-Rx®

    GT-Rx® Administrator Staff Member GT di Razza Pura

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    The two strips normally reside just inside the top of the airbox lid above the rubber intake boot. The rest I have no idea if the foam of the internal lid is intact.
     
  4. Bisbonian

    Bisbonian Cruisin' Guzzisti

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    There have been a lot of people, myself included, who have found these strips in the airbox the first time they take the tank off. I think this hole was just a useful trash can during assembly.
     
  5. NPS

    NPS Cruisin' Guzzisti GT Contributor

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    Mine are still there after 10 years. I always thought of them as acoustic and left them alone. I like a quiet induction sound.
    Perhaps a difference in assembly around how well they were glued down.
    Having said that I will check in the next few days as I want to replace the air filter. They may not be glued at all.
    Edit. I do remember a post a long time ago about mice nesting in an airbox and this might be a cause.
     
  6. kiwi dave

    kiwi dave GT Reference

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    My memory is stretching, but isn't there some sort of material glued to the bottom of the fuel tank? It might be deteriorating and going into the air filter.
     
  7. Tony D.

    Tony D. Just got it firing!

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    Dave, I didn't think to look under the tank for a couple of reasons but that makes perfect sense. Removing the tank for the first time and setting it down securely with a couple of gallons of gas in it while trying not to put any load on the side plastic "sponsons" was the one reason. The other was reason was I was too preoccupied with removing a broken wooden dowel from the cylinder as a result of being stupid :-(
     
  8. Averb

    Averb Tuned and Synch'ed

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    The foam under my tank was , I think, grey but it definitely stripped off as I was riding along and ended up in the air filter. Nearly killed me as it did it in all at once and choked the air supply to the engine as I was cutting through peak hour traffic.
    Steve
     

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