1975 50 hp evinrude starting at full rpm

[digong]

Please help me on my outboard, when i start the motor, it runs at full rpm so i gave to turn it off right away, what part should i looked into? Thank you in advance.

 

[gm280]

First things first.

:welcome: to iboats digong. Always great to have a new member join us...

I would first look at the carb(s) to see if the butterfly plates are open or closed. They need to be shut closed or near about when starting up the engine. If they are closed, next check the spark advance system. Either can make an engine riv higher then wanted. But I am thinking the carb(s) would be the first suspect, OR even an air leak around the carb to engine gasket. If the carb(s) never been disassembled and cleaned, now it the time. Buy a carb kit or however many you need and tear into the carb and rebuilt it. That never hurts a carb... JMHO

 

[digong]

Thank you very much, your first suggestion was the solution, both butterfly plates were open, i closed it and it runs perfectly.
, again, appreciate the response, it was so helpful to me as it is my first boat, I am hoping to learn more about the outboard so I can do the basis maintenance work and I do not have to bring to the shop....Digong.

 

[digong]

I have two more follow-up questions please;

what is the setting of the lever manual choke - 384066?
how do i rev the motor at the remote control?

sorry for these stupid questions, ordered a manual will come soon, thank you in advance for your advice.

 

[digong]

Right now, manual choke is at lower or start, if i move to middle, both butterflies are open.