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Replacement air filter
Posted: Tue Aug 26, 2014 12:21 pm
by Kool_Biker
My original Honda foam filter of some years, literally disintegrated on me as I was gently trying to get it off to have it cleaned.
The same happened to an original sealed Honda foam filter sitting in my parts box for many years; it did not even make it out of its nylon wrapper... Guess these things have a shelf life.
So I need to find a new filter.
The K&N website indicates their HA-0900 as suitable for the job and actually better than the OEM.
HA-0900_-_K_N_Replacement_Filters__Replacement_Air_Filter_direct_from_K_N.jpg
Assuming that the above is correct, does it in any way mess up carburation? Is it replace and forget?
Any thoughts?
Re: Replacement air filter
Posted: Tue Aug 26, 2014 1:59 pm
by ajs350
Aris
I found that the K&N gave me a brief flat spot around 4000rpm which went away when I replaced it with this paper filter from TIMS.
http://www.timscbx.com/Carburetor%20page%203.html
Ross
Re: Replacement air filter
Posted: Tue Aug 26, 2014 4:02 pm
by daves79x
Aris:
David Silver still has the foam socks or go the route Ross suggested with a paper one. I'd stay away from the K&N for the flat spot and also some chatter questioning their filtering abilities.
Dave
Re: Replacement air filter
Posted: Tue Aug 26, 2014 9:48 pm
by asacuta
I've used that K&N filter for years with no flat spots; however, I have to keep the cover on the air box. If I remove the cover, the engine does bog down in the mid range. If it makes any difference, my idle screws are set to 2 1/8 out. A K&N filter came stock on my DB7, so if these have filtering problems, Ford and Aston Martin don't know about it.
Re: Replacement air filter
Posted: Tue Aug 26, 2014 9:51 pm
by daves79x
The '79 carbs seem to be the ones most affected by using a K&N.
Dave
Re: Replacement air filter
Posted: Tue Aug 26, 2014 9:53 pm
by asacuta
Yes, mine is an 81; I have no experience with earlier models.
Re: Replacement air filter
Posted: Wed Aug 27, 2014 12:46 am
by Kool_Biker
Thank you guys for saving me from an unnecessary extra complication with the K&N, I could definitely do without :)
Re: Replacement air filter
Posted: Sat Aug 30, 2014 5:58 pm
by CopperCollar
Interesting, going through this now with an 80 that has vb62 carbs with a supertrapp 6-1 and K&N filter.
I thought it running poorly because it had sat so long. Pulled the carbs and found it had a Dyno Jet kit in it.
Long story short. I installed all new rubber and installed a stock filter and jetting. Ran the valves and checked compression. Still ran poorly.
Went back to the K&N filter, stock main and Dyno Jet needles in the 5th groove. They were in the third groove from the top. Runs and accelerates nicely now. I think I could go to the 6th groove and be fine.
I don't care for Dyno jet kits but the needles worked in this case. The stg 1 needles are less aggressive in shape than the stg 3 needles.
So lesson learned, these engines are very sensitive to airbox and filter changes and not to write off the Dyno jet needles without considering the characteristics of the bike.
Mike