i have just got a Suzuki Lt80 it runs great,but will not idle . you have to use the choke to start it when cold and hot (sparkplug is new and the right one/ air filter is new just fitted it /new fuel in tank) any help would be great. mate said to turn the idle screw but no matter which way you turn it nothing happens there is only one screw on the carb got the owners manual for the bike so i know its the wright screw im turning .....any help/ advice on this'd be great