Ok same old same old but i am desperate to sort out what i think is the auto choke on my 1990 sportral el. I believe that is it the choke playing up ( butterfly half closed when warm and idle about 1200rpm) coul ANYONE supply some info/a cure on tis one Also i am assuming that the large screw with a spring on the shaft and large ribbed head (for finger turning) is the idle speed screw? This seems to have no effect on my sporty