I recently purchased a 12' aluminum boat with a Johnson Seahorse 3 motor (made in the 1950's). The first time I used the motor, it worked great. It had been sitting all winter and took a few minutes to start up, but ran really well. Since then, it's been nothing but trouble. I've tried taking it out three different times and the results are different each time. The first time it started, ran great for a little while, then it started raining (dropped in temp) and it barely ran faster than the trolling motor. The second time it ran good for about 100 yards. Then just slowly started cutting out. The third time it didn't start at all...and most of the pulls the motor wasn't even catching. I replaced the spark plugs when we got the motor. I'm trying to figure out if it has something to do with high elevation since the first time was at a lower elev. lake (4000ft) and the last ones were higher (7000ft+) or if it's needs some repair. If it needs repair I might just have to buy a new one since most repair shops charge $100/hr. Any ideas?
