Originally Posted by neo1piv014
For instance, the pictures there showed some kind of white chicklet ring in the main needle spring, whereas mine was just a spring. I'm not 100% sure what it does, but I guess that I've been running without it for all this time so it couldn't hurt.
The DR650 also uses a lower spring seat. Suzuki calls it a "ring" and its part number is 13331-12D00. Without it, the needle will rattle and the slide spring preload will be reduced.
Did you inspect the float needle, slide guide, emulsion tube, jet needle, and slide for wear?
With the needle having been allowed to rattle around like that, I would be most concerned about emulsion tube, jet needle, and slide needle hole wear.
How many miles are there on the carburetor?