Probably a 2 stroke?I'm looking for a small light outboard for my dink. A local used marine store has a Johnson 2hp for sale. Looks ideal and priced at about $300. I believe the store services the outboards before they put them up for sale. Tag on motor said serviced 2 weeks ago and "comp 60". I did not get a chance to talk to the owner.
I know nothing about outboards but am guessing that comp 60 might be the compression? Is that low? What does the mean? I want a reliable motor but also thought this might be a good simple motor for me to learn about maintenance. What do you think?
Not that it matters too much, but in my experience, unless they have been terribly abused, 2 strokes are very reliable. Feed them new plugs once in a while and they are happy. IIRC, the last compression test I did on my 1985 Evinrude 35 HP 2 stroke was about 130 lbs. I have read, depending on the age & type of engine, that anything from about 80 to 100lbs & up is OK. Multi cylinder engines should have similar readings for each cylinder, within about 10% or so.
60 lbs sounds a bit low, but I can only speak from my own experience. Suggest you have the store run it for you in their test tank. Run it for at least 10 minutes, look for a good steady "pee" stream & if the tank will allow, run it hard for a few minutes. If the "pee" stream starts to steam or turns into steam, it is running hot. You should be able to put your hand on most parts of the power head without burning it. Look for peeling or discolored paint which may be caused by overheating.
If the store won't demo the motor for you, I would suggest you look elsewhere. If it runs & the propeller turns, the only likely problem could be overheating.