Compression testers have check valves, you can check it alone. Just pull all the plugs, disconnect the fuel line, ground the spark plug leads (or if the motor will turn over with the kill switch activated, just do that), open the throttle fully, thread the compression tester into a plug hole, and crank the engine for 5 seconds. The gauge will record the highest reading. Release the pressure, move on to the next cylinder and repeat until all 4 are done. Should take 30 to 45 minutes, the plugs on those motors are shockingly simple to access.
You in Bridgton this weekend? I could bring my tester.
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