"lunchbox" filter? More of my stupidity :-p

[lawman]

What K&N is the "lunchbox" filter everyone uses? 

Is it advisable?

Why would I use it or not use it?  Is it just for horsepower, or can it also improve gas mileage?

[Twiglet]

As far as I understand it the 'Lunchbox' refers to the stock air filter housing, which is essentially a large plastic box. The K&N direct replacement fits in where the stock air filter goes, as for BHP I doubt it will make much of a difference unless you use a K&N which replaces both the air filter and the housing, then you will prob need a re-jet etc

[ineedanap]

the lunchbox is a big k and n that replaces the entire airbox with an open element filter.  It is part number ru 2970.  There's a picture on the wiki.  You will need to rejet and it will add a few horsepower, and a few more if you pair that with a nice exhaust.  It will probably cost you a few mpg though, since you have to rejet richer.

[galahs]

[Twiglet]

Shows how much I know! 

[joshr08]

[ohgood]

What K&N is the "lunchbox" filter everyone uses? 

Is it advisable?

Why would I use it or not use it?  Is it just for horsepower, or can it also improve gas mileage?

the filter has already been explained-

advisable - sure, because you  can clean it and use again.

use = cleanable ^                        not use= cost/time to clean

it would take a finely tuned dyno to see any horsepower gains. very very little. improve gas milage - maybe, but you'll want to change jets to keep the mixture happy.

i get 50-60 mpg from a K&N lunchbox and a V&H supersport, depending on how I ride. if I putted everywhere, i could likely achieve 65 or so. dunno, i never put.

[galahs]

It improves performance a tad but does make the bike a hell of a lot louder. The induction noise is awesome around town, but can drive you insane if you want to do any long distance highway riding. Get good ear plugs!



When I fist installed my K&n without rejetting... the bike litterally would not rev past 6,000rpm because it was running so lean. That gives you an exampkle of how much less restrictive the lunchbox is over the stock setup.

[sticks]

just got my lunchbox, according to the wiki i just need two 140 main jets for my baby to be happy...

that said is there anywhere to get main jets cheap that isnt chapparal? i don't really fancy spending $6 for tiny ass jets and have to pay $12 for ground shipping.

[bill14224]

One thing about replacing your air filter with an open type like the "lunchbox".  Don't get caught in a downpour.  That's why the stock air box is what it is, so you can ride in the rain without drowning your engine.

[sticks]

One thing about replacing your air filter with an open type like the "lunchbox".  Don't get caught in a downpour.  That's why the stock air box is what it is, so you can ride in the rain without drowning your engine.

if you got one of those wraps ("precharger") for the filter would it help with that at all?

[The Buddha]

Precharger will make it cleaner for the motor and emininate frequent cleaning for the filter. May cos a wee bit of power.
Jetting right with K&N is like night and day over stock airbox.
Stock filter and air box is like breathing through your fingernails.
A K&N in air box is like being smothered with a pillow.
K&N lunch box is like sitting in a small room with 1 tiny window.
Velocity stacks are like poking your head out the window.
Jet it right and it will pull more revs, make more power and will wear the bike out faster. Like instead of 70K you'd lose it in 50K. Big freaking deal, cos you'd prolly dump it every 5-10K and possibly destroy it before that 50K.
Gas mileage - prolly lose a little, and will use more and more oil as it gets older and older.
Cool.
Buddha.

[LucPro]

So I searched the k and n site and there are no similar filters for my 04. Will this filter fit on my 04? Does anyone know the dimentions of the openings? Maybe I can get two individual universal air filters to put in place here.

I would appreciate any help...

[galahs]

Yep they fit, but they arn't listed as open air intakes are illegal in many places on newer bikes that have enclosed airboxes.



If you want individual pods, the Specs: 60mm inside diameter, 3" outer diameter

[fred]

One thing about replacing your air filter with an open type like the "lunchbox".  Don't get caught in a downpour.  That's why the stock air box is what it is, so you can ride in the rain without drowning your engine.

Really? Not that it rains too much around here, but my bike has been ridden for years in the rain with a lunchbox and without any ill effect... I just spent the last few weeks riding in the rain, some of it quite heavy, without any problems at all. The tank and engine do a good job of keeping water out of the airbox area. I only got the bike a year ago, but the previous owner is a good friend and the lunchbox was on the bike when he got it, and that was like 20,000 miles ago. If it made it 20,000+ miles without ever getting enough water in the lunchbox to cause problems, I think it isn't going to be an issue...

[fred]

Yep they fit, but they arn't listed as open air intakes are illegal in many places on newer bikes that have enclosed airboxes.

Wow, really? There are people who check for this kind of thing? I highly doubt you could find anyone of authority around here who would know or care what the stock airbox was and where it might be...

[galahs]

Here in NSW Australia they do. I hear they do it in California too.


As for riding in the rain... it is basially buried under the tank and the frame. Not much water gets in there. I rode for a day in a tropical down pour in northern Australia and it didn't miss  beat. Me on the other hand was soaked right through, and my boots were overflowing with water.

[fred]

Here in NSW Australia they do. I hear they do it in California too.


As for riding in the rain... it is basially buried under the tank and the frame. Not much water gets in there. I rode for a day in a tropical down pour in northern Australia and it didn't miss  beat. Me on the other hand was soaked right through, and my boots were overflowing with water.

I'm in California and no one here cares. There isn't even an inspection for motorcycles. If you bring a motorcycle in from out of state, they check a few things like frame number, mileage, and they make sure you have turn signals, but for the rest of us, there is nothing. The only time an official will ever look at the bike is when you get pulled over for doing something dumb, but barely ever happens. As far as I can tell, you have to be popping a wheelie in front of a cop with bald tires and no turn signals before a cop will even take interest in a motorcycle's equipment...

[LucPro]

So I bought the filter for the older models and it does fit on my 04.  The only thing is I have an extra breather hose coming off my airbox.  I hope It is not important.  I dont see the same part in the picture above....

any help?

[galahs]

So I bought the filter for the older models and it does fit on my 04.  The only thing is I have an extra breather hose coming off my airbox.  I hope It is not important.  I dont see the same part in the picture above....

any help?

See this threrad.
http://gstwins.com/gsboard/index.php?topic=5180.0