Bad compression.....decisions

I got a Evinrude 1972 20hp and a 1982 20hp very cheap. $75 for these two motors, a yamaha 24l plastic tank and a 13 fot speed boat.<br /><br />The guy I brought it from told me that the '72 worked after he stopped using it (18 months ago) and the '82 has a blown block.<br /><br />I've started working on the '72 and found that the lower chamber is at 50lbs (cranking manually with fly wheel) and the lower 10lbs. When I put my finger over the plug holes the lower chamber sucks and blows well but the upper only slightly.<br /><br />I filled the chambers with oil and soaked the cylinders well before working on the motor, so I guess something has happened in the last 18 months.<br /><br />My dilemma is, do I try and revive either one of these motors, or do I break them and sell the parts on ebay?<br /><br />Have just ordered new impeller, carb kit, fuel pump kit, etc.......Typical!

Re: Bad compression.....decisions

It's almost free to pop the head off and see what's wrong. If you're just spinning the flywheel with your hand you won't get a very high compression reading, unless you mean you used the pull-starter.<br /><br />What's wrong with the '82? Is there a hole in the block? If so, perhaps you could sell off parts of it to finance the other engine. I'll bet you'd get a fair price over there where parts are a little harder to find.

Re: Bad compression.....decisions

I installed the pull starter and got readings of lower 70lbs, upper 25lbs. The motor was unstable, I can test it with a better mounting, but I guess the results will still have the same difference.<br /><br />In Norway parts are rare but few are interested in buying them. People have money over here and tend to just buy new motors!

Re: Bad compression.....decisions

Pull the heads on both motors and have a look-see.