I have a 79' CVX 20 also and the guy I bought it from brought the starter in to have it freshened up and without him knowing the kid just switched heads (with an automotive one) and gave it back. Well needless to say he couldnt figure out why the boat would'nt run for a whole season then sold it to me. If you have a good shop in the area why not just have it gone thru? I had mine done and replaced the cables and it spins like crazy, good luck