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Discussion Starter #1
Hey everyone, recently rebuilt the carbs on my bike, clean all the carbs and did a rebuild kit on all of them, got them synced but whenever I turn the choke off or give it a lot of gas it just dies and shuts off, anyone know what could be the issue? I don’t know if it’s the air/fuel mixture screws?? Or what, any help would be awesome. It’s on a 98 gsxr 600
 

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Either of your symptoms point to a fuel starvation issue.

There could be a dozen reasons such as clogged fuel screen, pet cock not opening correctly, kinked fuel line, etc.

Did it do this before you rebuilt the carburetors?
 

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Discussion Starter #3
Yes it was doing this before I rebuilt them, when I first got the bike the guy had it sitting for about 3 months and said they should be cleaned. Once I got the carbs out noticed on carb number 4, the plunger was broke so it wasn’t even opening up. So I got a new plunger, replaced it and then rebuilt the carbs
 

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Make sure the tank is clean (screen? I'm not sure) and that the vacuum petcock opens properly. Also that the vacuum line to the petcock is hooked up correctly.

I guess I would hook up a hand vacuum tester to the petcock, disconnect the fuel hose and see if I got good flow when I applied vacuum.
 

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Discussion Starter #5
We aren’t using the tank right now to feed the bike fuel, we were using a clear container with brand new fuel so we can try and sync them, but trying to figure out the whole choke issue lol
 

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What initial setting are you using for the pilot jet screw? The manual is poor on this subject but it seems most are 2 1/2 to 3 1/2 turns out.
 

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The pilot jet screws weren’t backed out at all cause I couldn’t find it anywhere where it said how many turns out it needed, someone said they needed to be 3 1/2 turns out so that’s what I’m gonna try
 

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The pilot jet screws weren’t backed out at all cause I couldn’t find it anywhere where it said how many turns out it needed, someone said they needed to be 3 1/2 turns out so that’s what I’m gonna try
And there is your problem.
 

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Discussion Starter #9
Adjusted those pilot screws and get her to idle without the choke being on, but now she’s running too rich and when I give her gas she dies, do I just need to adjust the fuel/air mixture screws some more?
 

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Yes. You adjust the idle mixture screws till it runs well at idle and responds to throttle.

The usual procedure is to close the screw until you lose rpm, then open it back up so the rpms come back and then go further till it starts to decrease again. Keep track of how many turns you went between the points and set it about 1/2 way between. Lean towards the richer side.

Dying when you give it gas may be another issue.

I take it this is your first time working on carburetors?
 

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Follow the service manual and as much online info as you can find. From what I understand, you started on some of the most complex motorcycle carbs. And you have four of them :0
 

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Ok... It sounds like you don't have these setup correctly at all, BUT... What size jets did you use? Where did you set the needle clip? Where did you set the float height? And not last, John is correct, for fine tuning your idle circuit, the best method is "the highest idle" method...

Also, are you trying to do this procedure with or without the airbox. Do you HAVE the airbox? These are ALL very important questions that you need to know the answer to. John is also absolutely correct, by saying you chose one of the most complicated, and picky dam carbs to learn the fundamentals of carb rebuilding, lol... Here is a great link, that explains it all in very simple detail. They REALLY must be setup with this proceedure, or it will NEVER run right. Keep us posted, and feel free to keep asking as many questions as you need...

CV Carb Tuning Procedures
 
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