I just purchased a 1995 Yamaha Wave Venture. I am unable to pull on the choke knob. It seems to be stuck or somethng. Does the knob have to be in a certain position to be pulled. I checked the cables down to the carb and seems to be o.k.. The knob has a 2-lines with a lightning bolt in the middle. i even unscrewed the knob and pulled on the metal with pliers...no pull.