Boy I am having fun digging into my carb! Now that I have cut out the &^%($ float bowl screws I am inside. I have been referring to the "rejet your carb" technical note.

I have removed the brass screw and spacer for the main jet. There were no marks on these parts. Under the spacer is a chrome "tube" that wants to go up and down, but not come out? I do not see any needle or clip.

What is the vacuum slide? The article has some drawings but this is not labled.

Any other reference articles I should look at?

Rich

I have removed the brass screw and spacer for the main jet.

The main jet is more or less a brass screw. Once you take the bowl off it is right there. If you are stock it should have these markings on it. Photo courtesy of RK.




If you are looking in the tech tips under "Rejet your carburetor" it is the yellow jet on top of the tower in the upper left pic. Just want to be sure you are working with the right part.


I do not see any needle or clip.

To do the needle you need to go in through the top of the carb. On the top right pic you will see the "vacuum slide cover" which is black on the bike but green in the picture. You take that off. Once you take the cover off you will see the diaphram. Take the diaphram out and the slide with the needle comes with it. Down inside the diaphram is a plastic rectangular plug. Grap that with a pair of needle nose and pull is STRAIGHT out. You might have to wiggle it A LITTLE to get it out. Under the plug is the needle. Do this on a clean towell. There is a small spring in there that likes to get away from you and it won't bounce off a towell. When you put it back together be careful putting the rectangualr plug back in. It's easy to break off one of the ears that hold it in. You will see what I mean once you get it apart.

Read through the " Principles of Modern Motorcycle Carburetor Function" and you will see a good pic of where the PMS screw is.

If you need more help give a shout.

.<br><br>Post edited by: Musky, at: 2007/06/09 15:59

Yep, that is the part, but mine has no marks on it at all. I have to &quot;assume&quot; (with all its connotations) that the one that is in there now is the one from the Cobra Jet Kit - funny it has no marks. I was thinking the needle and the jet were attached - thanks for clearing that up - the article gets vague at that point.

I did get to the needle, again no marks. The clip is on the 3rd groove from the top. Cobra instructions say 4th. This would account for why my milage dropped so much when first installed - the dealer had it on the 4th clip. When I took it back he moved it to the third.

So, clip on 3rd space, assume Cobra Main Jet 175 amd Cobra pilot jet. If you remember I finall got into the carb to verify settings in an effort to figure out why the bike is running so bad.

Do this settings seem ok?

I did the SeaFoam in the carb trick Doc suggested, but then tore into the carb and have not run it yet. Seems like the &quot;too rich&quot; cause of SVS may not be the culprit. I am wondering how much oil the dealer put in. Need do check that next, and also pull the plugs.

As always, thanks for the help, and have a karma on me! Wish there was a 10x multiplier so I could send you and Doc a bunch at one time. Us fast white bikes need to stick together (and red too) - of course if mine was running right it would be faster....................

Sorry Rich, you can't assume. If you don't know what they are you might as well toss them and buy new ones. Check the head of the jets with a magnifying glass; sometimes they are hard to see.

Musky has covered most of your questions. That silver tube that move up and down was the needle from the backside. The needle move up and down inside the jet and that is what meters the fuel based on the position of the throttle.

As always I'd start with the DJ 180, clip on 5 (washer, clip, spacer, silver washer), #35 pilot (stock) and PMS 2.5 - 3. Then do the WOT to fine tune the main.

Then move the clip to 4 and test when hot and cold. Adjust needle as required.

Doc

If it's the Cobra jet I think they are Dyno. A 175 Dyno is around a 163.5 Mikuni. That's down there a ways. Dyno jets are marked too. The needle I don't think has any markings. I also think that the difference between the Mik and Dyno needles is that the Dyno is one washer shorter than the Mik. So if that's true a dyno needle on 3 would be like a Mik on 2.5.

Disclaimer - I haven't measured the needles myself. Just what I've heard from people who have.

My opinion is you need to go get either a Mik or dyno jet kit so you know what you are dealing with. Without markings you're just going to get frustrated and end up hating the bike. At the least you're never going to know exactly what you have

Hopefully others will hop in so you have more than just one persons ideas.

OK. See doc did hop in Hope you had a good ride Doc


.<br><br>Post edited by: Musky, at: 2007/06/09 16:34

Of course the dealer did not give me the unused jets - that would have been to easy. Sounds like a new jet kit is in order - who has the best price.

In the meantime - other than milage - is the current carb setup likely to be the cause of the sputter? Or do I keep looking? Things were fine for quite a while - something somewhere got funked up.

Musky wrote:
Hope you had a good ride Doc

Just finished supper and I'm about to go get some gas for the bike.... the long way.

Doc

WhiteStarNC wrote:
Of course the dealer did not give me the unused jets - that would have been to easy. Sounds like a new jet kit is in order - who has the best price.

If you paid for the jet kit then he ripped you off. He should have returned the kit to you, including the stock jets he took out.

In the meantime - other than milage - is the current carb setup likely to be the cause of the sputter? Or do I keep looking? Things were fine for quite a while - something somewhere got funked up.

You're asking me to guess .... sure. But you said &quot;things were fine for quite a while&quot; ..... so what did you do just before it started sputtering on you.

Bad gas?

Doc

WhiteStarNC wrote:
Of course the dealer did not give me the unused jets - that would have been to easy. Sounds like a new jet kit is in order - who has the best price.

In the meantime - other than milage - is the current carb setup likely to be the cause of the sputter? Or do I keep looking? Things were fine for quite a while - something somewhere got funked up.

As far as price I guess just go around to the bike parts websites and see who is charging what right now. If you do have dyno jets in there it sounds pretty lean to me but with no markings I doubt they are dyno or Mik. It's hard to say what is causing an issue when you don't know what you have. you can for now make double sure you don't have any air leaks. Good gas. No loose wires. Good plugs.

.<br><br>Post edited by: Musky, at: 2007/06/09 16:57

Sounds like my bike when the SVS set in. And yes the dealer jetted my bike when they put my pipes on and screwed things up. I bought all Baron's stuff and did the rework myself. Dyna or Baron's are both good and you will have stuff you know is all compatable. The needle the dealer had in mine looked like a tree trunk. Just ask Musky. Good luck on your jetting my friend. BTW I did the shock treatment and ran a few tanks of SeaFoam thru her and it got better each time.