60hp Yamaha Compression Testing

Newfielad

Recruit
Joined
May 25, 2010
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5
Good day people. I am going to look at a 2000 60 hp with electric start. I have an automotive compression tester (fittings are millimeters). Will this work on an outboard?

I've never done this before, and I understand you need to remove all plugs, but ground them, in addition to disabling the ignition system?? Can I leave the plugs attached to the plug wires and hold them against the block?
 
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