Honda-SOHC
SOHC.co.uk Forums => Recommended Sources for Parts and Services => Topic started by: totty on July 11, 2011, 01:28:09 PM
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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 (http://stores.ebay.co.uk/Ramair-Filters-0844-858-4658)
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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.
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Check out this article on the US site on the mid range flat spot http://www.sohc4.net/?p=275 (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.