Cant get 77/78 Evinrude 85hp to stay started.

:facepalm:So i have bought a 78 bass boat cheap of course and here is my issues. Last year i got the boat working but when i throttled up the boat bogged down. Over winter i replaced fuel tank, fuel lines, starter silinode, coil pack, spark plugs, and cleaned the carbs. Now my issue is that it is hard to start the motor when it kicks over it stalls after 30 seconds and wont start back up. While trying to start the motor it does not make a noise and wont start. After 10 min i can try to start it and it atleast atemps to crank. Could it be a power pack or one of the 4 coil packs. I'm hoping to trouble shoot with anyones help. I dont have a lot of money to send it to a repair man so thats not a option anytime soon. my motor is a 85 hp Evinrude 1977/1978. It looks clean and has run great once a pond a time. PLEASE HELP me get back onto the lake.

Re: Cant get 77/78 Evinrude 85hp to stay started.

Make sure the 20 amp fuse in the engine's wiring harness is not corroded. That fuse holder must be clean to make good contacts. Also, you may have a defective key switch in the control box. Unplug the red plug from the control box under the cowling. Jump start the starter. Once spinning, check for spark at the plugs. The engine will fire the ignition system once the flywheel rotates at least 250 rpm. (keep in mind, if the engine starts, you won't be able to shut if off, so test with the spark plugs out and grounded to the block.)