1978 Johnson 35 dies abruptly.

[aaroni]

I have a 35hp Johnson that will idle for a while, then just flat out die suddenly. No sputtering or anything it just shuts off. After it is off it will not even fire. I just had the carb rebuilt and have fresh gas and oil in it so I don't think it is a fuel problem, but who knows. Also I noticed some sludge coming out of the prop area after I pulled it off the water today. Not sure if it is related. Could the power pack be flakey? Thanks in advance.

 

[DJ]

Re: 1978 Johnson 35 dies abruptly.

What year? Post a Model and Serial number.<br /><br />The ignition systems vary for those engines.

 

[aaroni]

Re: 1978 Johnson 35 dies abruptly.

It is a 1978 Johnson model 35r78r Serial number E4882247.

 

[fireman57]

Re: 1978 Johnson 35 dies abruptly.

When it dies and will not restart check for spark. Could be a coil breaking down under heat after it warms up. The sludge is just unburnt fuel coming out your thru hub exhaust. I am at this point assuming that you do have thru hub. If you have spark and it's good bright blue spark then suspect a leak in a fuel line, bad fuel pump, stuck float, or other fuel related problem.

 

[Goodoleboy]

Re: 1978 Johnson 35 dies abruptly.

Perhaps your trying to idel to slow. Should be setup to idel about 750 or so.<br /><br />On the muffs about 850 to 900.<br /><br />Good luck!