16.5 MM, plus or minus 1.0 MM. The Ski-Doo quick reference book gives the dimension as the distance between the trailing edge of the primary and leading edge of the driven. Put simple, get a piece of wood, metal, plastic etc, mill it to 16.5 mm thick and slide it down between the two clutches. Wiggle the motor around till the measuring stick just touches each clutch without binding (like gapping spark plugs) and you should be in the ball park. Or measure the diameter of each clutch, add the two together, divide by two and add 16.5 to get the shaft center to center. Good Luck.
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