K&N air filters for 35mm Keihin FCRS?

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BrianK

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Anyone know what K&N filters would fit these? The originals on mine need replacing - they are oval-shaped and an incredibly tight fit. Shoehorned them off and on once too often and did physical damage.

I'd like to replace with somewhat smaller, and ideally round-shaped filters. I just got them back on; covered with grease and sweat and realized I'd forgot to note model number or to measure the carb spigots they clamp onto. Don't have the heart to do it again, at least not soon.

I did reach out to Matt Rambow at CNW and he may be able to help, but hoping others may be able to chime in.

Tx - B
 
BrianK said:
Anyone know what K&N filters would fit these? The originals on mine need replacing - they are oval-shaped and an incredibly tight fit. Shoehorned them off and on once too often and did physical damage.

I'd like to replace with somewhat smaller, and ideally round-shaped filters. I just got them back on; covered with grease and sweat and realized I'd forgot to note model number or to measure the carb spigots they clamp onto. Don't have the heart to do it again, at least not soon.

I did reach out to Matt Rambow at CNW and he may be able to help, but hoping others may be able to chime in.

Tx - B
Click to expand...
RC-1820

www.knfilters.com

Universal Clamp-On Air Filter

2"FLG, 4 X 2-23/32"B, 3 X 2"T, 2-3/4"H, OVAL
www.knfilters.com www.knfilters.com
 
BrianK said:
Anyone know what K&N filters would fit these? The originals on mine need replacing - they are oval-shaped and an incredibly tight fit. Shoehorned them off and on once too often and did physical damage.

I'd like to replace with somewhat smaller, and ideally round-shaped filters. I just got them back on; covered with grease and sweat and realized I'd forgot to note model number or to measure the carb spigots they clamp onto. Don't have the heart to do it again, at least not soon.

I did reach out to Matt Rambow at CNW and he may be able to help, but hoping others may be able to chime in.

Tx - B
Click to expand...
At a cleaning interval of 5 yrs or 75k miles at least you’ll not have to remove them again anytime soon and I’m grateful that Matt cleaned mine before shipping cNw #101 if they are that fiddly
 
Café au Lait said:
At a cleaning interval of 5 yrs or 75k miles at least you’ll not have to remove them again anytime soon and I’m grateful that Matt cleaned mine before shipping cNw #101 if they are that fiddly
Click to expand...
Call me distrustful but I definitely would not leave mine that long.
They are the lifeblood of your engine's airway.
I wash and re-oil mine every year - not a big deal.
I also keep a spare pair on the shelf.
Cheers
 
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Café au Lait said:
At a cleaning interval of 5 yrs or 75k miles at least you’ll not have to remove them again anytime soon and I’m grateful that Matt cleaned mine before shipping cNw #101 if they are that fiddly
Click to expand...
It's not cleaning that's the issue (although I do like to clean and re-oil more frequently than that). I've mangled mine in the process of removal/reinstallation to deal with the carbs themselves, most recently to install a set of Jim Schmidt's 32mm -> 30mm intake port sleeves (the installation itself was easy; getting to the ports was a PITA thanks to the air filters).
 
BrianK, any chance of some pics of your set up?
I’m struggling to understand your space issue (I’ve been using these carbs for 10 years now)…
 
BrianK said:
Thanks. That looks like the ones I have on there - too big for available space. But I see the flange measurement is 2", which is helpful. Tx - B
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I bought shorter front rubber adapters with narrower SS clamps - gave all the room I needed.
Before the tops of the carbs also rubbed on the triangular plate frame brace - no issues now.
Cheers
 
That's the issue! Rob do you by chance remember where you got those adaptors?
 
Got it!!
I bought from this place - https://mikunioz.com/?v=13b249c5dfa9
Not cheap but works a treat!
Screen Shot 2024-04-29 at 9.28.01 am.png

 
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BrianK said:
That's the issue! Rob do you by chance remember where you got those adaptors?
Click to expand...
Brian
Here is a photo of them fitted - gives just under 20mm clearance from the back of the filters to the battery tray plate.
No problems (now) in removal and fitting filters!
Cheers
K&N air filters for 35mm Keihin FCRS?
 
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