Question about K&N air filter and jetting

[Tyrant171]

First of all, I'd like to say that I'm sorry for bombarding you guys with so many stupid posts lately, but I've been so lost with everything and your posts have taught me so much.

Anyway, I have this 97 GS500 that I recently bought and now I must rebuild the carbs because they were leaking into the cylinders (the bike, so far, has been nothing but a pain in the ass). Now, the guy I bought it from installed a K&N air filter......which would make the jetting different than stock, right? What I hope to do is reverse everything this guy had done to the bike (craptacular neon light mod, spray paint on 2 panels, stickers everywhere), which would include putting a stock air filter in the bike. I hope to order the stock air filter through BikeBandit and install the stock 122.5 main jets (I think the guy put 128 jets in there). Will this work? Will I be able to just take out the K&N and put a stock filter in and replace the main jets?

This may be an astronomically dumb question, but I'm really new to this.

[The Buddha]

He had 128's in it ... OK you are screwed ... Open the top of carbs and pull the needles out ... if they have 5 notches on them ... OK leave it alone and pray ... you got DJ ... The correct stage 1 ket with DJ needle on clip 2 is supposedly 118 ... Buy a 117.5 mikuni and use that maybe ... If You have K&N lunch box filter and its got pipe ... you prolly need DJ134 mains or try mikuni 135's ... that's the stage 3 ... IN any case ... stock mains wont do for the stock air filter ... cos its a DJ needle ... In any case post the setup and we might have a better guess ...
Cool.
Srinath.

[Tyrant171]

Or......if I were to keep the K&N filter in, what kind of carb set-up would I need? What size jets would I need? I don't know if the p.o. knew what he was doing when he re-jetted it (he's an idiot), so I'm thinking he maybe used the wrong size jets.

[Tyrant171]

What if it's not a DJ needle?

[cummuterguy]

why would you want to go back to paper?  Ok, nevermind, it's your bike.

Stock mains are 122.5, but most people go with 125 mains on a pure stock bike.

Stock primary jets are 37.5 (in case he changed those too)

check your jet needles to make sure there arent any washers under the clip, stock doesn't have any other than the fat plastic one

check your float heights and the float needle tips for damage/wear for that flooding issue

edit... left room and came back while typing this...  ok this is all for non-dynojet set-up

[The Buddha]

If its stock needle ... Its got some numbers on it ... N-027 or whatever ... if so ... all our jetting tricks will work ... so we're good ...
Cool.
Srinath.

[Tyrant171]

So.....notches on the needle would mean it's a DJ needle. No notches and numbers instead would mean stock needle?

Sorry, I need everything explained very basically.

[Tyrant171]

Um, I saw you said something about Dynojet. He DID have a Dynojet sticker on the bike, so I'm guessing he used one of those kits.

[cummuterguy]

yeah, you got it... by notches he means small slots in the shaft of the needle that allow a circlip to be installed on them.  there should only be one on a stock needle.

I didn't notice numbers on my stock jet needles, but then again, I wasn't looking for them...

[Tyrant171]

Ooooooh, okay, I think I'm getting it now. Because he used the Dynojet kit, they're probably DJ needles, in which case I should get a 118 main jet? That would be cool for the K&N filter?

Sorry srinath, your post was really confusing to me at first with all the numbers and whatnot. :O

[cummuterguy]

suzuki stock jets (mikuni) and Dynojet jets have a different numbering system.  

srinath is suggesting a 117.5 mikuni jet or a 118 Dynojet jet (if you can find a pair without buying the whole kit)

you still need to check the needles. just because all signs point to them being Dynojet ones doesn't mean the previous owner didn't just stick in the mains and skip that step...  (dumber things have happened)

[Tyrant171]

Alright.....I'll definitely check the needles ASAP (my carbs are currently in my friend's garage). So, what do you think this guy could've done wrong during the re-jetting if he used the Dynojet kit? Could the 128 main jets be the problem?

Also, thanks for all your help man.

[cummuterguy]

well IMHO the first wrong thing he did was use a Dynojet ket...lol

not sure, I thought stage one was a 118 and stage 3 was 134... I've never seen a stage 2 I think Dynojet did away with that kit.

[Tyrant171]

So what the hell was this guy doing if he put 128 jets in using the Dynojet kit? I would imagine that the kit comes with the 118 jets. Hmmmm.......I hope I'll be able to get to the bottom of the problem with my carbs.

[The Buddha]

OK DJ kit comes with 118, 122, 128 and 134 mains ... The needle is a steeper taper and more drastic in the last 1/2 inch I think ... You have K&N lunch box and pipe right ... 134 is the mains they want you to use, and needle on 3 position ...  If you are runnig stock filter in stock airbox and stock pipe I guess 118 DJ mains are the right ones. I guess you should confirm what needle you have and post back ... and also what filter and pipe ... Then we can rig some sorta combo that might work ... DJ kits have gone awry for a lot of people ... even those following exact instructions ... That slide drill and plug and in general the concept of very steep tapered needle is basically flawed ... they strated that idea by telling people ... hey you dont have to take carbs off ... just take the tops off and install these needles ... Then slowly it got so complex they just added and added crap till its now far too complicated for anyone to do it right ...
Cool.
Srinath.

[oldskool]

this doesn't have anything to do with the DJ problem, but, do the pilot jets need to be nonbleed type?  i read in a previous post where someone specified nonbleed pilots.  if i order #40 mikuni pilots, are they already nonbleed or do i need to specify that i need nonbleed?
thanks for any advice.

[The Buddha]

Buy non bleeds in 40 ... and dealers screw up or cant find it ... often ... I have ended up sending it to people ...
Cool.
Srinath.

[Tyrant171]

Okay, I looked at the carbs but couldn't find the needles. Are they under the black covers on top?

[callmelenny]

Okay, I looked at the carbs but couldn't find the needles. Are they under the black covers on top?

Open the top of the carbs and pull up (carefully) the diaphragms. That long shiny thing is the needle.

You do have a manual right?

[Tyrant171]

Yeah, I have a manual. Anyway, I pulled out the needles and there don't seem to be any notches. So, I dunno if the p.o. used a Dynojet kit or not. As I said, the main jets were 128.

Well, my friend's dad (who has been working on bikes his whole life) said that he wants me to get the stock main jets (122.5) and the stock needle jets and that will work fine (he's going to re-jet it for me). I told him that I read that, with a K&N air filter, you cannot use stock jetting. He said that's nonsense.....now I dunno what to believe. HELP!!!!!!

EDIT: Actually, there are 5 notches at the bottom of the needle, by the washer, but aren't those on every needle jet? There were no numbers on it, either.......