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1972 Mercury 650 3 cyl timing

It is quite bright and warm these mornings. So, I though I could keep the boat and engine inside the garage to set the timing.
Is it a good idea to set the timing with a timing light without the spark plug wires connected?

It seems I could attach the spark meter to the #1 spark plug wire, disconnect the other two wires and be able to set the throttle primary pickup at 0 to 2degrees BTDC and then the max spark advance to 23 degrees BTDC. But, I'm not sure this is a good idea.
I'd like to keep the engine inside the garage and not pull the boat out. the instructions day to burn all the fuel out of the engine so it won't fire when cranking to set the timing.
Thanks for your help.
 
I isn't. Never run a motor with a plug wire off--bad for the switch box (and stator).

I time my Mercs by removing the top carb's throttle cam (one screw) so I can hold the throttle wide open (about 3,000 rpm) and set the timing perfectly.

Jeff
 
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