New alternative aircleaners for JS flatlside carbs

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jseng1

jseng1

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See the alternative aircleaners for JS Flatlside carbs and the airflow comparisons. Flow tests courtesy of Jim Comstock
Note that the K&N pancake and the XS pod have the best flow and are now available.

Open 34mm flatslide carb with no air cleaner = 206 CFM airflow


Standard pod aircleaner 178 CFM air flow (available) fits within backing plate.
New alternative aircleaners for JS flatlside carbs



Alternative standard pod aircleaner 181 CFM air flow (availiable on request)
New alternative aircleaners for JS flatlside carbs


Unifilter sock = 182 CFM airflow
New alternative aircleaners for JS flatlside carbs



K&N pancake (fits within backingplate). 192 CFM airflow per carb (now available)
New alternative aircleaners for JS flatlside carbs



Hi flow XS (K & N pod copy) 195 CFM airflow (now available) must remove backing plate
New alternative aircleaners for JS flatlside carbs
 
Hi Jim

How much is the K&N pancake air filter, I had a set on my old Amals for over 30 years and never had any problems with them, as long as they get serviced they way they should, the backing plate is no problems with my bike as like yours my 850 is in a Featherbed frame and there is plenty of room behind the carbies.

Ashley
 
ashman said:
Hi Jim

How much is the K&N pancake air filter, I had a set on my old Amals for over 30 years and never had any problems with them, as long as they get serviced they way they should, the backing plate is no problems with my bike as like yours my 850 is in a Featherbed frame and there is plenty of room behind the carbies.

Ashley
Click to expand...

The new aircleaners and prices are at my website

http://www.jsmotorsport.com/products.asp
 
Jim, will these by chance fit Keihin FCRs, or if not, do you have any that do? Tx - BrianK
 
jeffdavison said:
Brian,

I bought a Keihin FCR (Sudco) kit and it came with a pair of K&N Filters. The K&N part number is RC-1820. They look like the XS filters pictured above. I assume anyone that carries K&N can get these.
Summit Racing has these:

http://www.summitracing.com/parts/knn-rc-1820/overview/


JD

BrianK said:
Jim, will these by chance fit Keihin FCRs, or if not, do you have any that do? Tx - BrianK
Click to expand...
Click to expand...

RC 1820 is correct for the Keihin FRCs . Those flow at 195 CFM
 
Someone posted on here a measurement for a K&N filter that will work with the stock ham can setup but the screen needed to be cut down for it to fit.
I like the stock look. Does anyone remember the filter size from K&N?
 
When I received and installed my JS flatsides from Jim I installed K&N Pod filters RU-0982. Though a tight fit they have worked out very well. I use K&N filters in all my vehicles. Including my 11 second 69 Dart, Thruxton and ATVs and my class 8 Dodge Race truck(sadly destroyed in the San Felipe 250 during a prerun of the course. Cactus jumped out at 90 mph and I barrell rolled 8 times).
I just loosened up the air cleaner backing plate so there was some play and made sure the attachment bands were tight when I was done.
 
sole survivor said:
When I received and installed my JS flatsides from Jim I installed K&N Pod filters RU-0982. Though a tight fit they have worked out very well. I use K&N filters in all my vehicles. Including my 11 second 69 Dart, Thruxton and ATVs and my class 8 Dodge Race truck(sadly destroyed in the San Felipe 250 during a prerun of the course. Cactus jumped out at 90 mph and I barrell rolled 8 times).
I just loosened up the air cleaner backing plate so there was some play and made sure the attachment bands were tight when I was done.
Click to expand...

You can see the K&N RU 0982 here

http://www.knfilters.com/search/product ... od=RU-0982

They are the same size and have the same flow as the XS filters but are a little more expensive
 
I didn't get the XS' because of the chrome ends falling off on multiple Triumphs we have placed them on. Combined with the heat and vibration the chrome cap just falls off.
 
sole survivor said:
I didn't get the XS' because of the chrome ends falling off on multiple Triumphs we have placed them on. Combined with the heat and vibration the chrome cap just falls off.
Click to expand...

This problem is usually the result of ethanol fuel softening the glue on the cap. I have seen that problem with some brands of air cleaners. You are probably talking about an older version of the product that did not have alk proof glue. I have just tested the XS filters I have in stock and they are alk proof.
 
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