1974 70hp Evinrude stalls at take off

[miichael18]

ok guys and gals. i got a 1974 evinrude 70HP 3 cylinder that i have owned for 10 years. iv done all of the work myself on it and when i took it out the other day it stalled on me taking off. when i crank the engine up i have always had to choke it warm or not but it always fire right up when i choke it. now everytime i put in gear and go to take off it chugs lugs and dies. if i hit the electric choke while trying to take off it gets up and goes and once it going it runs good doesnt miss or anything. also if i just pull the choke out (manaul) just a small amount it will take right off. I took the carbs off all 3 and cleaned them out good and put them back on same thing. I have never rebuilt the carbs in the 10 years iv had it but i have cleaned them out once when i bought it and now this time. do you think its time to rebuild them or is there something else causing this? once you get it going it runs fine and it idles fine but it just wont take off without hitting the choke. Thanks.

 

[Daviet]

Re: 1974 70hp Evinrude stalls at take off

It sounds like it is time to overhaul the carbs paying attention to the tiny passages under the core plug on top of the carbs. Make sure you remove and clean both the idle and high speed orifices, clean and blow out all passages in the carb body.

 

[miichael18]

Re: 1974 70hp Evinrude stalls at take off

It sounds like it is time to overhaul the carbs paying attention to the tiny passages under the core plug on top of the carbs. Make sure you remove and clean both the idle and high speed orifices, clean and blow out all passages in the carb body.

well i ordered 3 carb kits for it. is there anything special i need to know bout the rebuild? where is the core plugs located at that i read about drillling out? thanks

 

[nwcove]

Re: 1974 70hp Evinrude stalls at take off

unless they were painted over you cant miss them, small dime sized, maybe a bit smaller/bigger, aliminum plugs. you will see them in the carb kits. (unless you have a good memory, take lotsa pics as you work along)

 

[miichael18]

Re: 1974 70hp Evinrude stalls at take off

are they in the bowl area of the carb? take bowl off and they down behind float in carb body?

 

[Daviet]

Re: 1974 70hp Evinrude stalls at take off

Look below, #5 is the core plug that you take out.
http://www.ishopmarine.com/ishop/js...CatFilter=BRP&eCatSupFldr=supplier-100-005-EJ

 

[miichael18]

Re: 1974 70hp Evinrude stalls at take off

ya i found them it has 3 core plugs one in bowl 1 on side and 1 on top