I have a 1959 Super Seahorse 35hp with electric start on a 1962 14-foot Mirrocraft runabout. For the last two summers it can start in gear (at high RPM's) but not in neutral with the throttle limit. It needed a lot of gas to run, too much for limit.
I finally realized that I had mistakenly left fuel in the motor over a winter, and went through the carb twice, cleaning out the orifices with air and carb cleaner, removing the jets, cleaning the bowl. While at it, set points and replaced plugs. Put new primer bulb on fuel line. Checked compression - 120 in both cylinders. Adjusted low speed: gently seat, then 1-1/2 turns out. Adjusted high speed: seat, then 1 turn out. Put knobs at 12 o'clock, tightened screws. Re-attached linkage. Put all back together and ran in 55 gallon drum. Ran better than in years. Started in neutral. In neutral, throttle all the way down, still purred at idle. Throttled down has always killed my motor. Ran 5 minutes. Tried in gear. All worked. Brought to lake for camping trip on island 2 miles off shore. Figured I would set high speed on lake with friend.
At Dock, boat would not start, again, and had to get family in and start in gear. Ran sluggish at best. Died on the water half way, then after 15 starting attempts, got us to the island. At island checked motor again. Priming causes fuel to exit high speed jet behind butterfly, and the small intake to right of main carb intake. Ball never gets hard. Well, it did once, with fuel not coming out, and it started in gear, but died in a few seconds for what sounded like too rich mix. Then back to fuel pouring out of carb air intake.
I mess with again, prime sends fuel out butterfly again. I remove starter and carb (on water with 1-2 foot waves-never again). Carb looks clean. Float seems to float. Put back together. Stayed at motor while wife on key start. I work throttle from linkage and bypass throttle limit. Starts, run for a few seconds, fuel pouring out of butterfly. Cannot idle. Killed starter battery in frustration. Towed to shore.
1. Should I order rebuild kit? Sounds like it can only be the needle if fuel not stopping. if so, why, beyond murphy's law did it run flawlessly in the drum?
2. How can/should I set or adjust the needle/float assembly? I did remove it to check the needle and clean out its orifice. Cork float seems OK. What should I do to check it better.
Thanks ahead for any advice.