Evinrude 65 hp motor (please help!!!!)

[Chrismonroe31]

I have a 65 hp evinrude triumph outboard motor. 2 stroke and year is 1973 I believe. Anyways, motor starts and runs amazing in the driveway with muffs but on the water it must be choked rigorously to start. Once started I can drive all over the lake, idle down, even go I to neutral or turn the motor off for a few minutes and it’ll fire right back up. Give it more than 20 minutes in the water however and it takes a lot of effort to start again. What is the reason for this? It fires right up easily with muffs but why not in the lake? All 3 cylinders 125 PSI, ran seafoam through carbs, new fuel filter, so frustrating!! Any advice would be appreciated. Also please forgive me if I didn’t put this question on the right forum, it’s my first time and I didn’t know where else to turn for help

 

[oldboat1]

Make sure it's not overheating (top of head shouldn't be too hot to touch), measure spark on all three. Disassemble, soak, and clean carbs.

 

[racerone]

They all---" bark and roar " in the driveway.----They sound really powerful to the untrained ear.-----I would start with a load test on the battery ( even if new )----Then inspect battery cables.-----Then take starter apart for inspection / ohm check on commutator to shaft.----Then check adjust and operation of the choke solenoid.----No money spent doing these checks.