My wife has a '89 EX250 i've been trying to get this thing to idle correctly with no luck. What happens is when you give it gas it won't idle back right away it will hold at like 2500 RPM's for about 3-5 seconds and then return to about 1000-1200 RPM. I even bought another set of carbs and put on, also i checked the valves and adjusted them, lastly i took some carb cleaner and sprayed all around the boots and carbs to make sure that i didn't have an air leak and i can't seem to find one. Any help would be appreciated. I think it is an air leak somewhere but i'm not sure where.