I have a super nice 85 ct70.. yes 85... it usually runs perfect... now it likes to just start going WOT on its own after warmed up... it starts on first kick, then i dialed in the idle so it idles fine, air screw is out like 2.5 turns. bike runs fine.... i go for a short ride and come back,,, put it in neutral. then all of a sudden it revs to wot.??? the throttle slide is not stuck,,, the throttle handle goes back and forth with spring in it. all the carb and manifold parts and tight together with good seals/gaskets. carb is tight on air box looks good other then rubber boot a bit hard but dont think that should cause this... is it an air leak>?? and if so, why does it start fine until i ride a block then starts to rev high?? can it be anything other then air leak? stuck float? can throttle glide be stuck but handle still spring? its scary when wot and i have to kill it by turning off.. any ideas???