Carb Air/Fuel mix screw....Where?

[RJsfishin]

Still new to me '01 Bike, runs good, but the idle feels like it could use an air/fuel mix adjustment. I don't see one. Is it under a plug that has to be removed ? Could anyone give me the location of the screw/plug ?

[Vegas Street Rider]

I believe it is on the right side of the carb body under a brass cover cap. These thing are set up pretty lean coming from the factory. Turn it all the way in a then back it out around 2.5 turns for starters and then adjust from there as needed. I know there are pictures of the location on the forum but I can't find it at this time. Someone else will probably remember and steer you in the right direction.

[blaine]

Originally Posted by Vegas Street Rider

I believe it is on the right side of the carb body under a brass cover cap. These thing are set up pretty lean coming from the factory. Turn it all the way in a then back it out around 2.5 turns for starters and then adjust from there as needed. I know there are pictures of the location on the forum but I can't find it at this time. Someone else will probably remember and steer you in the right direction.

Yep....In front of the float bowl.

[RJsfishin]

Originally Posted by blaine

Yep....In front of the float bowl.

If I'm looking at the correct brass plug, is it installed from bottom to top, making the idle mix screw in a vertical position rather than horizontal like most ?
And am I correct in concluding that removing the carb would be the best way to remove the plug ?

I did this once before on a previous s-40 650,.....looks like the same plug, only it was in plain view and horizontal, and easy to remove.

Rich

[derbydave]

Yes the pilot jet is installed vertically. I don't think you could get the plug out without taking the carb off. I had mine on the bench when I serviced the pilot circuit.

[RJsfishin]

Originally Posted by derbydave

Yes the pilot jet is installed vertically. I don't think you could get the plug out without taking the carb off. I had mine on the bench when I serviced the pilot circuit.

Dave.
I have the carb off. I started drilling the the smaller plug, the one that is in the long boss hanging down. But it doesn't look like brass. I see a larger brass plug behind this one, but up higher, both being in front of the bowl.
Is this larger brass plug for sure the one that will uncover the air/fuel mix screw ?
Rich

[Vegas Street Rider]

You might want to download the GZ 250 service manual. It has a pretty good breakdown of the fuel system with pictures. Hope that helps you.

[RJsfishin]

Thanks guys !