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RamAir - Universal cut to shape panel of twin core Ramair Aeriform foam

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totty:
I've just gutted an old 550 airfilter and replaced the element with some of this foam and I'm quite pleased with the results.
For half the price of a new filter I got enough foam to do 4, fitting it was a very simple job with a glue gun and Stanley knife, and best of all it's made a massive mid rpm improvement - although it obviously wouldn't do that for a well jetted bike, mine had a bad flat spot.
I can't comment on how well it lasts or filters but it looks allot better quality than other foam filters I've used in the past.

Here's a link to their ebay shop http://stores.ebay.co.uk/Ramair-Filters-0844-858-4658

mickwinf:
interesting how it affects mid range running,my k3 is standard everything but seems to lack mid range and also has a flat spot just over tickover (see "slugish 550")Might try without filter and se if that makes difference.

totty:
Check out this article on the US site on the mid range flat spot http://www.sohc4.net/?p=275

I found raising the needles (lower clip one notch) helped allot but it still wasn't quite right so I was going to try further jetting changes, but after changing the filter it's miles better.

What I find a bit odd is I had previously tried it with and without a filter and it made no noticable difference to the flat spot, but I'm not certain of the order I tried it in so it may have been before raising the needles.

I didn't try the suggested ignition changes as I have a Boyer kit fitted.

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