Re: compression test
Pretty easy. Make sure your battery is fully charged. You don't want the motor to actually start so you have to disable the ignition system by engaging the "Kill Switch" by pulling the lanyard off of the Kill Switch. This will allow the starter to turn the motor over, but it won't start.
Pull the spark plugs out. Insert the compression tester into the spark plug hole and crank the motor over five or six times. Check the readings and proceed to the next cylinder. Some folks have indicated that you have to push the throttle to WOT to get a good reading. I've tried it with the throttle position at WOT and at idle with no affect on the compression readings. Readings should be within 10% from the highest reading cylinder to the lowest reading cylinder.