1991 60hp Johnson Misfire

[renvette2]

My 1991 60hp Johnson has begun to misfire. It started about 3 weeks ago. I have replaced the spark plugs, but no improvement. It starts and idles fine, but when I get up to about 20 or 25mph, the misfiring begins. Any help is greatly appreciated.

 

[tashasdaddy]

Re: 1991 60hp Johnson Misfire

Welcome. what do you mean by misfire, do it go bang like a gun? or just sputter, like it is not gaining rpms? surely sounds like clogged high speed jets in the carbs. read cleaning carbs in the TOP SECRET FILE, the 1st thread in this forum.

 

[Cofe]

Re: 1991 60hp Johnson Misfire

If the carb. is not the problem, suspect a blown head gasket. Getting water into the combustion chamber will cause misfire, "this happened to me" anyhow I hope it is only a carb problem...

 

[renvette2]

Re: 1991 60hp Johnson Misfire

Welcome. what do you mean by misfire, do it go bang like a gun? or just sputter, like it is not gaining rpms? surely sounds like clogged high speed jets in the carbs. read cleaning carbs in the TOP SECRET FILE, the 1st thread in this forum.

When I'm running WTO, the engine jerks and then it appears I lose power in one cylinder.