K7N filter mod update

[jumpin' Jack]

Now that I have my ride torn down for paint I pulled out the K&N filter mod that I bought way back when.
I didn't like the fact that the new filter was so much smaller and required the removal of the top of the air box.
I found that the K&N filter # 33-2256 will fit IN my stock filter plate once I cut a little plastic away. Now I can open the factory air box to suit my needs as the new filter has the same media area as the old so I can take full advantage of the increased air flow provided by K&N over stock. The best part is that it was only $42.00 delievered, ordered on the net at K&N Filter.com
Jack

[asacuta]

Jack:

Did you have to cut plastic away from the air box or the filter?

[jumpin' Jack]

You take the stock filter out and cut away the filter core area including the verticle walls of the media area. at that point the new filter will drop in the trimed out factory piece with 3/4" below and 1/4" above.
There is a gasket included with the filter that cah be attached to the plate to bring the filter up another 1/4" and help in sealing the filter in.
After that you can modify the air box to what ever you like. my first thought was to drasticly reduce the plate area on top to reduce the length of the square ducts to just behind the little flapper valve ( probable an important feature for cold weather starts) the reduction of this square duct will free up the flow without changing the original openings. Warm weather riders could cut additional holes to free up incoming air but would effectivly loose the function of the little flapper valve ( choke )
Jack

[cabo246]

Jack,
How has youre K&N mod that you did holding up.

What did you do for the top cover. Is the mod kit there selling give more air flow or do you think youre modification to cut in that other K&N is better?

I want to do this really soon, I live in Boston so we get some cold days for sure here.

-John

[dog]

Evoluzione is about to make a filter to fit perfect,he's taking the bike apart as I speak,it's a matter of days or a couple of weeks and it'll be posted and up for sale. Hang in there for a perfect fit. His company has a lot of X employees from the K&N company. He owns a Rune and he's our man. Hopefully he'll read this and update us all. I hate to disturb a work in progress. dog

[hgslayr]

asacuta.. you dont have to cut your airbox but I recommend cutting the 2 channels off the top of your airbox for better airflow and increased sound when accelerating...sounds like a four barrel carb opening up with the filter top turned over on your old hot rod. You can buy a new top for $42 from Honda in case you ever need to take it in for warranty issues. I recommend using a razor utility knife to cut aound the paper OEM filter to get the outer frame for your K&N fillter to drop into. Its difficult to find an adhesive to glue the gelotinous rubber K&N filter to the polyethylene frame of the OEM filter. Polyethylene has no surefire bonding capabilities so you'll have to experiment. We used an adhesive called E6000 purchased at Tapp plastics. Gorilla glue may work well also...either can be likely found on line.
Is eveluzione gonna provide the same million mile warranty and will dealerships accept it like K&N?

[dog]

Who ya kiddin,it's a friggin filter allowing more air = more speed. Million miles,there's probably only 5 of us on here with that kind of mileage. I'd like to see who'll hack up there box before he's done and offered his version of the exact OEM filter duplicated with the technology of K&N-but from his company,and you take out the old and replace with the new. I'm wondering the same though if someone hacks up their plastic box (Will that be covered under warranty) Dealerships don't need to carry it either cause the more hands in the pot,the higher the price.We will all be able to buy direct. =saving money. But it sounds like you've done your homework with a replacement box at a price of 42.00 dollars. I've got a ton of faith in this guy and it'll be a perfect fit. I hope he reports back to us real soon with his companies progress. And maybe a price-I'm sure it'll be excellent. Myself Thumber and all of K&N people have exhausted our resources. It's now up to him. Hang tight folks. dog

[WIZ]

can't wait, would love to have a drop in fit.....
thanks dog....

[ETXRune]

ALL.....dog is right :yes:
We've waited this long, a few more weeks won't hurt. Doesn't make sense to me to be cutting up things, especially when we have something in the works.....

[evoluzione]

thought i should jump in here before there is too much misinformation. first off, i don't employ any ex-k&n employees. the company that builds all of our european air filters was started by a couple of ex-k&n employees. we've been designing and using this filter element for ~7 years now on bimota, ducati, aprilia, benelli, bmw, etc without issue.

as to making a drop-in filter, i've been testing a mockup and honestly, vs. a clean stock filter, not much difference (at least not enough to justify tooling up and producing the filter). on the other hand, we then prototyped a race airbox kit (like we use on the aprilia & bmw) and wow - much crisper throttle response and mid range pull. in fact, it might be too much since i had to run in a higher gear to better manage throttle response.

bottom line, at this point we're not going to pursue a drop-in filter any further - sorry. as to a race airbox kit, we may go further if there appears to be enough interest. this will be a true bolt-on product with no modifications to original parts (i would guess price to be in the $200 range).

[asacuta]

As long as I don't have to dismantle half the bike to bolt-in the new airbox (tilting the gas tank would be OK; removing it would be tolerable), I'd be interested.

[hgslayr]

Who ya kiddin,it's a friggin filter allowing more air = more speed. Million miles,there's probably only 5 of us on here with that kind of mileage. I'd like to see who'll hack up there box before he's done and offered his version of the exact OEM filter duplicated with the technology of K&N-but from his company,and you take out the old and replace with the new. I'm wondering the same though if someone hacks up their plastic box (Will that be covered under warranty) Dealerships don't need to carry it either cause the more hands in the pot,the higher the price.We will all be able to buy direct. =saving money. But it sounds like you've done your homework with a replacement box at a price of 42.00 dollars. I've got a ton of faith in this guy and it'll be a perfect fit. I hope he reports back to us real soon with his companies progress. And maybe a price-I'm sure it'll be excellent. Myself Thumber and all of K&N people have exhausted our resources. It's now up to him. Hang tight folks. dog

Dog...I'm not wanting a mill. mile warranty, I just want to be assured that dust and debris is not getting into my engine via the air filter. Most dealerships have accepted K&N filters as good as their OEMs...If you tell them you have Evoluzione filter will they still do your warranty work if its related to the filter?.....probably not!
Even if I had a stock K&N filter I would still cut the top of the air box off for even air distribution. When I did my K&N mod and was installing it ,I noticed that all the dirt on the orig filter was on the filter near the front
entrance of the box. You can tell that the air is not being distributed towards the back barrels. I purchased a new air box top for $42 from Honda in case I need to make it Stock for any warranty work.
If I drove it in the rain I dont think I would cut the top off...even though it would be difficult to get water up under the tank where the air box top is located. NKBRKR has a photo of the top cut off if someone wants to pm him. Maybe someone at the West Coast rally will drive my Rune and give you the report on the power and sound difference. Hopefully i'm not ruffling the Dogs fur.

I just read Evoluziones post so I'm editing this post....the proof is in the airbox mod with a K&N mod or Evoluz filter...much more throttle repsonse and better sound. I dont think the K&N by itself would make much difference without more air...very poor air intake design by Honda. The air has to go thru the tank bottom, travel towards the back of the box, make a 180 turn, go towards the front of the box thru the channels, makes another 180 turn and into the airbox where its distributed across the filter.
Therefore cutting the top off opens the whole filter for air coming thru the tank without all the turns.

[evoluzione]

As long as I don't have to dismantle half the bike to bolt-in the new airbox (tilting the gas tank would be OK; removing it would be tolerable), I'd be interested.

if you can lift the tank (not remove it), then you can install the race airbox kit.

[evoluzione]

Dog...I'm not wanting a mill. mile warranty, I just want to be assured that dust and debris is not getting into my engine via the air filter. Most dealerships have accepted K&N filters as good as their OEMs...If you tell them you have Evoluzione filter will they still do your warranty work if its related to the filter?.....probably not!...

as to our filter media, it is the same cotton guaze that k&n uses (sourced from the same factory) - we do use larger pleats for better airflow. and as to dealers accepting it, all i can tell you is that we have dozens of ducati, aprilia & bmw dealers that use & install our filters with no problem. but, if you are at all unsure about any product we may offer then your best bet is not to use it.

[WIZ]

evoluzione........i am real interested in the air box replacement....with your companys filter....i would even take the prototype,changing the air box makes more sense to me....than just another quality filter exchange......and i enjoy confidence in business,i respect that line,,,,
"unsure about any product we may offer then your best bet is not to
use it"............yes sir, and well said......

[NK BRKR]

BEFORE:
http://image2.frappr.com/pix2/i/20070317/e/7/f/e7f1cca1d6427f6ed30bfcf835040b5a0_medium.jpg

After:
http://image1.frappr.com/pix1/i/20061127/3/0/6/3061b2e87d365637fed4d29b8b6015f80_medium.jpg

The after is with the OEM filter still installed, which afterwards I installed the K&N filter as HGSLYR was talking about. As Evoluzione said, the K&N filter makes a difference but it is the inlet of air that allows the biggest difference. The OEM top for the filter is designed with Honda covering their bases for people who ride their bike in the rain. The 2 main inlet are at the rear of the filter and travel back toward the front of the bike so that the filter will not get wet. The bad thing is that 90% of the air is pulled through the filter in an area about 2"x3" max, and when that part of the paper filter is dirty it will reduce air flow quite a bit. With an open box and a K&N filter the filter area is increased 80% and the airflow of the filter is increased greatly vs OEM paper! Thus those of you with drilled exhaust will even notice a bigger difference since more air in and more air out = horsepower! My bike NEVER sees water in any form so I don't have to worry about my filter getting wet, but those of you who brave the elements may not want to do this mod.

[evoluzione]

The after is with the OEM filter still installed, which afterwards I installed the K&N filter as HGSLYR was talking about. As Evoluzione said, the K&N filter makes a difference but it is the inlet of air that allows the biggest difference. The OEM top for the filter is designed with Honda covering their bases for people who ride their bike in the rain. The 2 main inlet are at the rear of the filter and travel back toward the front of the bike so that the filter will not get wet. The bad thing is that 90% of the air is pulled through the filter in an area about 2"x3" max, and when that part of the paper filter is dirty it will reduce air flow quite a bit. With an open box and a K&N filter the filter area is increased 80% and the airflow of the filter is increased greatly vs OEM paper! Thus those of you with drilled exhaust will even notice a bigger difference since more air in and more air out = horsepower! My bike NEVER sees water in any form so I don't have to worry about my filter getting wet, but those of you who brave the elements may not want to do this mod.

did you notice any idle speed changes after your mod? the reason i ask is that we found with our airbox design the idle went up a couple hundred rpm (we assume due to the lower air restriction of the airbox). if we put the stock setup back on, the idle goes back down.

[hgslayr]

My idle did not change,although my idle has always been a little high.
NK BRKRs seems to have a normal idle (lower than mine). Did you take it out for a drive and let the ECM adjust?
I have gotten used to the high idle especially in the summer when the fans kick on and draw the idle down....might be too low if idle was lower.
We also capped off the cold air intake valve hose and left the air sensor in its orig. place.

[3putt]

The idle on my bike started running a little fast last week. I spoke with the honda mechanic who works on Runes and Wings regarding changing the air filte(mine was 3 years old but only had 10K miles on it. He didn't think it would make a difference but did recommend running the bike very hard for a while and use no higher than 91 octane gass. I changed the air filter(it was rather dirty), ran the hell out of the bike and switched to 91 octane gas and the idle speed returned to normal. Don't know what did it but I'm happy now. :lol:

[NK BRKR]

I had No difference in idle after changing the filter box and adding the k&n. evoluzione, are you using a forced air inbox on the rune? I could see if you changed it to a forced air where the inlets come out the front or something, that might change air to fuel ratio enough where you might get a high idle.

[Douyon]

hey runski, what mod did we do on my Rune. Do you remember?