SV650 Supersport legal air box? Where do I get?

[lbk]

Well after being DQ'd for this, I need to find out what to do so that it doesn't happen again. I have a K&N air filter and it apparently came with it's own top piece to the air box, since I bought the bike that way I don't have the original. Can you just use an original part with the K&N filter or do you have to get one from K&N with the same size opening as the original?

Someone please help me become legal. One time being DQ'd is all I care to have.

[Protein Filled]

You can buy the stock air filter from Suzuki...or a Suzuki reseller. That is all you need to be legal. It includes the top piece you are talking about.

[lbk]

Yeah I saw that it is all one piece. But won't that mess up my jetting?

[Protein Filled]

Which version of the K&N do you have? The one that has a real big hole? If you do, then yes, you will have to rejet. I can give you some baselines to try when re-jetting, but the best way to get it spot on is to put it on a dyno that has a EGA sensor.

Baseline jetting that I ended up using when my SV was stock (without using a jet kit) running a full M4 exhaust:

Main Jet: 140
Pilot: 15
Air screw: 2 1/2 turns out
needle: one shim under stock needle.

If you get a jet kit, then follow their instructions.

This of course varies according to the conditions, altitude, your bike, cams, cam timing, etc. My current jetting is leaner than that.

[lbk]

Not sure which one I have but when I compared it to one that was legal at tech didn't look very much bigger. Basically the tech guys two fingers wouldn't fit inside a stock on, but barely did on mine. So I assume that shouldn't make too much difference then huh?

Also I really have done any carb work on mine, I had 4&6 dyno tune it but it seems to be running a bit rich right now occasionally it backfires. So if that's the case, decreasing the size of the air intake to me would seem to make it run even richer. Excuse my ignorance I'm not a real good carb tuner in fact never touched the carbs. The bike has whatever jets it had on it when I bought it. It has a full system (Micro) and the K&N filter with the cover that apparently comes with the kit.

[Protein Filled]

Actually, it sounds like you have the K&N with the smaller hole opening. Actually, those flow worse than stock, so you may not even have to rejet at all.

Backfiring doesn't always mean that your main jet is too rich. It could be the air screws or the needle being too rich (or lean).

Can you call 4&6 and ask them to see if they can tell you the jetting that is in it? Some shops log all their work and keep it in the computer.

Where do you live? You may want to call around some shops around and find someone who may do a dyno run for cheap. Here we have a couple of shops who do dyno runs the first Thursday of every month for something like $20.00. They can tell real fast whether you are lean or not.

BTW, The stock main jets are 138's.

[Super Dave]

For supersport, the rules are really specific.  

Got to go by the letter of the law there.

If you had it done at 4&6, go back there.  They use an eddy current dyno, so they can to consistent, repeatable runs.

Did you use race gas?  What did they dyno it on?

[lbk]

Yeah I know supersport is a really strict class. I will give a call up there to see if I can find out what is in it right now for jetting. I run 93 octane pump gas in it no race fuel.

Super_Dave, not sure what you mean by what did it run on? Are you reffering to fuel? If so the best of my knowledge it was on pump gas I had some in the tank when I took it to them, and personally have never put race fuel in it. So I doubt they would put it in just to dyno it. But maybe.

Thanks for the help, I'm going to just go ahead and order the stock air filter, then put it in and see how it runs. I'll post the jetting once I have it and any adive would be greatly appreciated.

[Super Dave]

Reason I ask is that sometimes a person will put in a different fuel than what it was dynoed on.  Specific gravity, oxygen content, leaded or unleaded can make a difference in the speed of the burn, the actual amount of fuel that gets in the engine, and the air fuel ratio of the combustion.  

At least you can try to rule something out....

[lbk]

Well thanks for all the help guys, but I'm gonna let the experts handle this one. Just talked to 4&6 I'm going to drop the bike off after replacing the filter and let them take a look again at the jetting.

[salex43]

SS class isn't that strick they let Ed Key run his SV in LWSS.   ::)

[Super Dave]

LOL, yeah, but Ed follows the letter of the rules...exactly.