question about the K&N air filter on a GS500F

[mountindewGS]

I have had a 04 Suzuki Gs500f for a year now and I was wonder if the K&N air filter really give you a increase in horsepower and torque?

also I read in one of the post that a guy name rclz, put a dynojet kit and Almost get a increase of 4 HP. with just that dynojet ket, so I was wonder where you can get that dynojet ket from? It's just a jet ket right?

[sprint_9]

If you do a filter I would reccomend going with a pod, and then using some sort of aftermarket exhaust, in the newer GS's case probabley a slip on of some sort and then figuring out what you need to do to the jets and then purchase some mains, pilots, and needle shims, hopefully someone will post up on what they have in a homemade kit for your bike.  I did the above listed mods on my 93 GS and it turned it into a new bike, well worth the investment.

[mountindewGS]

No, Im not looking for a aftermarket exhaust. Im just looking for a small mods like air filter or something. by it self dose the K&N air filter not do anything? what a  pod?

[sprint_9]

Well then no dont buy a pod, it has never been proven to work with a stock exhaust.  Filter in the box would have little improvement, maybe one or two horse with the proper jetting.

[Roadstergal]

If you increase airflow at all, you'll have to rejet.  Exhaust is a much more effective mod than intake.  You don't need to do dynojet; I just put one size up on the mains on my '04 and it ran great (and a decently smooth dyno curve to go with it).

[mountindewGS]

alright,
So what a  Filter in the box? and what kind of jetting? So I just need to go up one jet?

[sprint_9]

Check the Faq forum for some numbers on jetting, Im not sure if its there but its worth a shot.

[Roadstergal]

Not on '04s.  I just looked through my notes, and I didn't write down what size I used.  I can ask tomorrow.  It was one up.

[mountindewGS]

Please look it up for me and get it back to me.

This sounds like what I want to do, K&N pods - Go up a few more sizes, and one more washer on the needle - I ended up at 142.5 before I did the exhaust.
But what is a K&N pods?

[Alphamazing]

Maybe I'm just a cynical little prat, but I don't like K&N filters. They don't FILTER as well as OEM ones. Sure, for the track it's alright, but I like keeping stuff out of my engine.

[ditchdoc1017]

Roadstergal
   Did you just change the main and not the pilot?

[tdan553527]

There are 3 jets on the 04+ (mid, main, pilot). By going up just one size, you will need to go from
17.5 to 20 on pilot
60 to 62.5 on mid
130 to 132.5 on main

This is with the UNI drop in and wileyco, 2.5 turns out on mine

When I changed to the KN Pod
22 pilot
62.5 mid
137.5 on my main
3.5 turns with this setup on mine.

The 04+ are also already shimmed with one washer under the needle.

[mountindewGS]

There are 3 jets on the 04+ (mid, main, pilot). By going up just one size, you will need to go from
17.5 to 20 on pilot
60 to 62.5 on mid
130 to 132.5 on main

This is with the UNI drop in and wileyco, 2.5 turns out on mine, What exactly is a UNI drop in and a wileyco?

When I changed to the KN Pod
22 pilot
62.5 mid
137.5 on my main
3.5 turns with this setup on mine.

Which one do you think was better horsepower and torque wish?

[Alphamazing]

Maybe I'm missing something here... but why on earth would you want to go up that many sizes on the main jet? Stock is a 127.5 on an '04, so why would you go up 10 sizes on the main? Main jets don't even kick in until upper revs. Is the GS THAT lean? I'm thinking about playing it safe and just getting a DynoJet or FactoryPro kit.

[mjm]

The Lunchbox or pod type K&N fileters installed without changing the exhaust make a significant difference the jetting required and the feel of the bike - I disagree with those who say you cannot get it right without also changing the exhaust - On my 2001, before I changed out the exhaust, I ended up one up on the pilot, one up on the mid main and at 140 on the main.  137.5 seemed a bit stronger in hot weather - but it ran lean towards the end of the riding season here in Wisconsin.  I would rather run a bit rich (giving up a bit of power and running a bit cooler) in hot weather than run too lean in the cold.

[Alphamazing]

What if I run a full exhaust with an OEM filter though?

I still don't see how bumping it up to THAT large of a main jet is beneficial...

[sprint_9]

First off there is aboslutly nothing wront with the K&N filters, thats all anyone runs on sprint cars, well most dirt racing cars for that matter and I have seen our own personal 17k engine torn down and there was absolutly no dirt inside, no scaring of the cylinders at all, so if it works for that application then it sure will work for the GS, or any other street application with flying colors.  The key to a K&N is properly maintaining them and coating them with a good coat of oil after you clean them, if you dont do either of that then they dont work but if you follow directions there there isnt a better filter out there.

For an example, on my 93 GS I went from a stock 122.5 main up to a 150 when I did the pod, pipe combo, and the bike ran great, I also adjusted pilots, but my numbers dont apply to the new bikes, its just to show you the jump I made.

[Alphamazing]

Yeah, and that's what I don't understand. A main jet size of 150 is HUGE. No one has been able to tell me why they need a main jet that big.

[tdan553527]

Maybe I'm missing something here... but why on earth would you want to go up that many sizes on the main jet? Stock is a 127.5 on an '04, so why would you go up 10 sizes on the main? Main jets don't even kick in until upper revs. Is the GS THAT lean? I'm thinking about playing it safe and just getting a DynoJet or FactoryPro kit.

Stock on 04+ main is 130, according to the supplemental manual, and the one I pulled out of my bike. 10 sizes? 1 size =2.5, so I only went up 3 sizes compared to stock. $80 for a Kit or $30 for DIY and learn something, I'll take the knowledge anyday, and it's really not hard to do.

I liked to first setup better and just recently went back to that setup. Which brings up that I have a K&N Lunchbox for sale. Anybody? Anybody?

[Alphamazing]

Ohhhhhhhhh. 2.5 = one size.... all the same. 150 is absurdly large.