Idle issue

[bakirkwold]

On my 450. It will be idling at 1,100 or so then I will rev it to about 3 or 4 K then when i let off the throttle it dips back 800 or 900 and i have to give it a bit of gas just a little so come back to 1,100. Whats going on? Any ideas? The air screws are at 1 turn out.

 

[Nessism]

What maintenance have you performed? Detail the condition of the bike so we can help guide you.

 

[bakirkwold]

Pretty much everything. Carbs are clean and everything. The floats are good and set right. http://s1116.photobucket.com/albums/k577/bakirkwold/Suzuki GS450 L project/

 

[bakirkwold]

one thing I forgot is that that carbs haven't been synched. And as far as I know they never have.

 

[Nessism]

Assuming you changed the intake boot O-rings, and the boots are in good shape, I'd try 2.5 turns on the idle mixture pilot screws. And sync the carbs.

A getto sync can be performed by jacking up the idle to 2000 rpm or so and then pull off one spark plug at a time. Adjust the sync until the idle drops the same amount with the bike running on one cylinder.

This technique won't work if you haven't adjusted the valves; you need an engine that's generally solid.

Good luck

 

[Suzuki_Don]

You're idle mixture is too rich, that's why the revs dip below 1000rpm when you throttle back.

 

[btbarb]

You're idle mixture is too rich, that's why the revs dip below 1000rpm when you throttle back.

+1, a bit too rich, I would leave as is unless your plugs tell differently or you're working on gas mileage.

 

[bakirkwold]

Alright. What's the ideal idle speed? And is turning the screw out make it leaner? And one other thing. The plugs are a bit on the white side. Any ideas? The O rings look good but I haven't replaced them. I did sand down te carb boots because they where a little bit warped. I also do not have the copper washers for the synch cab tube. I used some different ones. Maybe it's leaking there? I know I am talking out of my butt but the more into the better.