I just bought a 1976 Catalina 27 with a Yachtwin 9.9 2-stroke motor. I'm assuming the motor is about the same year as the boat. The seller didn't know for sure. The boat is not easily accessible right now, but I need to replace the spark plugs in the engine. Does anyone know what size plug and/or what size plug wrench I need? I would hate to get down to the boat and find I can't get the plugs out and therefore have lost a day of sailing. Also, I'm trying to find an owners manual for the engine. Any ideas where to find one?
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