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Norge airbox enquiry.

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Huzo:
Can anyone tell me what the foam cushioning stuff inside the lid is for ? After 19 years, mine has started to disintegrate so I’ve removed it.
I replaced the plugs at the 20,000 k interval and noticed an unusual sooty deposit on them that coincides with the destruction of the foam.
I wonder if it’s been ingested and burnt onto the plugs ?
Anyway, the foam has gone and she has new plugs…!  :bike-037:

John A:
I believe it’s for noise reduction. That’s also why they put snorkels on the air box. Open intakes can be almost as loud as the exhaust sometimes.

Huzo:

--- Quote from: John A on July 19, 2026, 09:54:01 PM ---I believe it’s for noise reduction. That’s also why they put snorkels on the air box. Open intakes can be almost as loud as the exhaust sometimes.

--- End quote ---
Oh, ok.
Thanks John.

Vagrant:
Just for noise for sure.

guzzisteve:
There is no foam on the inside of airbox. It is on the underside of tank & the outside of the air filter lid. I have cleaned out more than a few from sucking in the foam. If it is inside it got sucked in when dry rot happens. It crumbles & falls off. If you don't check your airbox at all, I would start.
Aprillia uses a different item, use it to replace it under tank. The foam will cover your air filter BUT NOT GO THROUGH iT unless you have a crappy seal. You could use a GTM lid rim to hold filter so you can see in airbox anytime tank is lifted.
I don't think you are burning foam unless you run no air filter.

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