Just put 100 miles on my 250ET, working great. Biggest carb problems I've experienced with it is fuel level. Two high it floods...too low it hesitates on throttling. Does it have a plastic view tube on the clutch side of the carb? If so, this is used as a view tube for fuel level in conjuction with ajustment bolt on bottom of carb. If this is your setup, I can also pass on some initial High/Low idle screw settings. Anyway, at idle fuel level should be about half to 3 quarter up the tube. Don't forget to losen the view tube screw. Hope this is of help
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