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    1967 Evinrude 18hp Fastwin with 25hp Carb: Trouble starting, staying running

    Can you be specific, racerone, so I can learn from what you're seeing? What looks worn or damaged (cylinder walls, rings, piston crowns, piston skirts)? What photo(s) show the wear or damage? Thanks.
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    1967 Evinrude 18hp Fastwin with 25hp Carb: Trouble starting, staying running

    I'm reporting back after following the advice I was given by members of this forum. Thanks very much for your help. flyingscott, I agree that the 25 carb didn't make this 18hp a 25hp. But I learned that--by reading discussions on this forum--a year after I bought the motor. oldboat1, I agree...
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    1967 Evinrude 18hp Fastwin with 25hp Carb: Trouble starting, staying running

    Thank you for the info, racerone. I will implement it to the best of my ability. I understand your frustration about people not heeding advice, because I've noticed that you and others provide helpful advice to a huge number of people in these forums. I truly did try to heed the inspection...
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    1967 Evinrude 18hp Fastwin with 25hp Carb: Trouble starting, staying running

    For two years I've owned a 1967 rope-start Evinrude 18hp with a carb from a 25. I bought it from a part-time mechanic who claimed that made it a 25hp. I've since learned--through this forum--that installing a 25 carb on an 18 does NOT make it a 25. In any event, the motor ran fine when I...
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    1970 18HP Evinrude: At WOT, RPMs vary greatly

    Thank you, Oldboat1 and Ryan 98. I will follow your suggestions and report back. I have more info. I went out on the river this morning and did more testing. I brought a new purchase: a hand-held visual tachometer (reads flash from piece of reflective tape you put on the flywheel). First 15...
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    1970 18HP Evinrude: At WOT, RPMs vary greatly

    Thank you. Good suggestions. Have carried out all but the last. Will do so tonight.
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    1970 18HP Evinrude: At WOT, RPMs vary greatly

    Am reporting back, asking for more feedback because the problem has not been resolved. Over the past month, a mechanic has done the following, in this order: Tested compression. Installed new spark plugs. Tested spark. Tested a new fuel pump. Carefully examined all wires on the stator plate...
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    1970 18HP Evinrude: At WOT, RPMs vary greatly

    Thanks much, kbait. I'll start eliminating causes, starting with the easiest. Any explanation why both cylinders run a small portion of the time, but 1 cylinder most of the time?
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    1970 18HP Evinrude: At WOT, RPMs vary greatly

    I own a 1970 18HP Evinrude with manual start, which I purchased a year ago. I purchased it from a man who does outboard repair from his garage, who has many years of experience working on them. The motor starts with ease, idles smoothly, and appears to run well at low speeds. But starting...
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