I just bought a used 16ft 1975 vhull it has a 20hp mercury tillerd handle and its probly form 1975 to (not sure). and i got to pull start it and i cant find the idle on it. on the handle it says shift, then start, then fast ive crancked it up and it sounds like its wide open, i havent tryed to crank it in the water yet but i have in my drive way. can anyone tell me how can find the idle on it i dont wont to through my self out the boat.