I inherited a 1972 johnson 65hp outboard and tried to put it in the water and it started and seemed to run fine until I tried to give it some gas. When I cranked the throttle all the way forward the motor sounded likt it was at 1/4 throttle! NO power at all. This is what I did:
Compression test-110psi to 120psi
Made sure the choke was not sticking
Fuel bulb pumped tight
and more that I cant think of right now.
I noticed that when the motor is in neutral and I rev the carbs they come right up. But under a load they just dont rev up. When I pulled the plugs(new ones) the two top cylinders were soaking wet with oil. The bottom cylinder was crystal clean. I sprayed carb cleaner into all three cylinders and the top two carbs bogged (as expected) when I sprayed into the bottom cylnder it burned the cleaner right up and the motor actually reved a little. So I am not sure if the two top or the one bottom is messed up. Please help!?!?!
Also the new plugs I bought were the ones listed on the front of the block, but when i look them up at various sites the plugs listed are completely different. (yes I did try both). How do I know whats right? I think the ones online were L77JC4and the ones listed on the motor are UL77V(which is listed for a 73 V4 best I can tell). How could that be listed on my motor unless the parts are similar, which I doubt. Thanks for any help guys.