1985 25 hp johnson question

[iRich]

Hi, I have a 1985 25hp Johnson outboard that just recently developed a problem. For awhile it was just a bit of spitting and sputtering here and there na dthen it moved up to when the boat was at around 3/4 to full throttle it would just quit. Now it is at the point that when I tried to take off the last time out it died before it even got on plane. The only way to get it to start after it dies is either wait awhile or take out the plugs and crank it a few times.
This sounds like it is flooding, right? I did rebuild the carb last year and it looked clean as a whistle inside and I blew out all passages ect.. It runs fine on the hose. I have also decarbed it with deep creek. Is there anything else I could check besides the carb that would make it flood or do you think the problem is in the carb? Thanks,

Rich

 

[AlanR]

Re: 1985 25 hp johnson question

Good Spark? Check your compression

 

[iRich]

Re: 1985 25 hp johnson question

yeah, it has good spark and compression - thanks.

 

[jtexas]

Re: 1985 25 hp johnson question

Primer solenoid (if so equipped) is one possible suspect.
Fuel pump - sometimes a leaky diaphram drips fuel into the manifold.

But it really does sound more like float adjustment or float valve stuck open.

What do the plugs look like when you take 'em out?

 

[iRich]

Re: 1985 25 hp johnson question

the plugs are new and they do have some black residue on the tang.

Rich

 

[jtexas]

Re: 1985 25 hp johnson question

They should be a little oily after idling. But the plugs from a flooded cylinder are more likely to be clean.

 

[iRich]

Re: 1985 25 hp johnson question

just an update...It seems I pinched the fuel line beneath the carb when I reinstalled it. it must have been letting just enough fuel through for low speed operation.