I HAVE A 1965 40HP EVINRUDE. I WANT TO REPLACE THE CARB FROM A LOW SPEED FIXED HIGH SPEED TO A ADJUSTABLE LOW AND HIGH SPEED CARB. I HAVE A SPARE FROM A 28HP 1964 EVINRUDE. IF I CAN DO IT, CAN I CAP OFF THE ROD THAT RUNS FROM THE CARB TO THE POWER UNIT AND HOW CAN I DO THAT?<br />THANKS FOR ANY OF YOUR HELP.