76 Johnson 40 hp

[jbsiv]

I have a 76 40hp Johnson and for some reason it will not keep running. It will crank up when I have it choked but when I do not it will not crank. I think that it may be a fuel problem, but I have checked to see if the fuel is pumping into the carb and it is. Could someome please give me a little guidance on what to check next or what it might be. Thank you.

 

[JB]

Re: 76 Johnson 40 hp

Sure sounds like a gummed up carburetor to me, jbsiv. It could also be a carb that is set too lean to run the engine.

Will it keep running if you keep it choked?

 

[jbsiv]

Re: 76 Johnson 40 hp

No, it will idle for about 30 sec. but then it will die.

 

[jbsiv]

Re: 76 Johnson 40 hp

the boat ran great the day before, I had out on the water for about 3 hours. The next day it just died and now it will not stay running

 

[tashasdaddy]

Re: 76 Johnson 40 hp

things break, and clog. check your spark, check your compression. but, i agree with JB. carbs, fuel lines, ethanol poison. read Ethanol, Carb cleaning in the TOP SECRET FILE, 1st thread in this section.

it will start with just one cylinder firing.