2000 Savage, stock except the air breather box has been removed; instead, there is a grey foam filter.

The filter is, I think, too large and is partially jammed against the frame.

Can anyone suggest a K&N or similar that would work in its place?

I can see filters that look like the right size on Amazon, but don't know enough about it, to know if they vary at all.

Will I have to retune? Or would this be similar enough to the foam filter?

That filter looks to be a Uni filter.  I have one identical to that on my engine and it looks to be a bit squished but mine proves it functions just fine,  which has significant engine mods.  The Uni filters are excellent at flowing air and filtering the incoming air.
Don't just assume that it’s hampering air flow unless you have identifiable symptoms indicating such.  

+1 for RC1250 !
Just for fun, this year I'm trying the snorkel between the carb and the KN. Larger air capacity. Will report later!
Cheers!  

zipidachimp wrote on 04/22/24 at 23:53:54:


You may have to get creative using the stock snorkel tube.  It’s wider at the end that attaches to the stock air box.  Its ID is 2.5” compared to the carb flange area which is 2.25”.  Maybe you can shove the filter into the opening of the snorkel and put the clamp on the outside of the snorkel.  If you set it up, share a pic!  I like the idea to get the full surface area of the filter in some wider open space to breath.

Cool.  Yeah, finding the narrower band clamps is tough.  You have to pay up and special order.  But ya gotta do it.  You can do better than zip ties.  Cheers.

I like the concept.  Thanks for sharing the photos.

Is the seat going to fit without it pushing down on the filter and possibly pushing it out of alignment and loose from the boot and carb?  

The band clamps for the air box boot (snorkel as you call it) are 70mm and 64mm.  Both are 8mm wide.  Parts 8 and 9 on the diagram link below (roughly $6 each).  Is the flange on the K&N filter making a good tight fit in the boot?  If not, the band clamp may not hold it in place since it’s designed for a specific size and it doesn’t let you crank it any tighter than designed.  If not, you’d need a narrow worm gear clamp that gives you more adjustability/clamping.  I think I searched the entire internet, hardware stores, and auto parts stores for the narrower 8mm worm gear clamps.  I didn’t have any luck, so happy shopping and good luck.  Holler if you find ‘em!  I want some to have handy.

https://www.partzilla.com/catalog/suzuki/motorcycle/2006/boulevard-s40-ls650/...

Thump: The dip in the frame is now gone, and I'm using a flat seat, ie; a standard.
https://www.flickr.com/photos/151017922@N02/53678582507/in/dateposted/
Thanks for the parts source!

If this intake works, I may glue the filter to the snorkel. Natural fit without clamps is iffy.
Cheers!  
ps: turned 80 in Feb., everything I do now is for fun and/or experimenting/goofing around!