yep its a leaky valve for sure i didn't know those floats would ever sink so again i learned shitTune-A-Fish said:Put a fuel line onit and blow in while slowly depressing the needle/float arms that little sprung peg in the needle should stop the flow of fuel before it bottoms out, if not check the needle and seat, if yes it stops air dead (about half way) you can be certain the floats are needing adjustment or well... don't float, fill the bowls with something and see, alcohol works well and dries fast. dont use acetone lol if all floats well search the part number for the float level on the goog and set accordingly not close but spot on as possible.
Also if you have a YZ 85 carb off the other bike, that thing will work nice on this motor with jetting dialed.
but it could be the overflow brass tube is frozensplit