I have a 1984 Johnson 150 hp outboard that idles well and starts up on the first try.
When I put her in gear and open her up right away she chokes out and dies. However, if I run it at a slow speed (2-5mph) for a while I can eventually open her wide and she will do 40 mph with no problem. I had a compression test done on her and that came back fine. On Saturday I had all 6 carbs cleaned and rebuilt and I ran sea foam through her. I took it out to the lake and it started right up and I was able to go from neutral to top speed with no problems. About 30 mins later however, the same problem occurred. If you have any ideas I would love to know. Thanks!
When I put her in gear and open her up right away she chokes out and dies. However, if I run it at a slow speed (2-5mph) for a while I can eventually open her wide and she will do 40 mph with no problem. I had a compression test done on her and that came back fine. On Saturday I had all 6 carbs cleaned and rebuilt and I ran sea foam through her. I took it out to the lake and it started right up and I was able to go from neutral to top speed with no problems. About 30 mins later however, the same problem occurred. If you have any ideas I would love to know. Thanks!