i have a 1985 ct70 - new air filter , new spark plug, carb is fine etc..fuel flow good i am having a problem with the bike stalling while in first gear and sitting idle...the bike idles fine in neutral - but when in first gear will stall... i turn up idle and turn in air screw..... all good on idle - idles perfcet - the choke is very sensetive... if bike is idling fine in neutral and i turn choke on and reduce air bike will go wot / full throttle.. whats wrong here??? i have been trying to fix this for ages.. there are no air leaks as i have sprayed carb cleaner all over while running and no changes... can it be something in the carb? can in the the choke? any ideas????