1991 225 Johnson Help

[dsinger]

I have a 1991 Johnson that I cannot figure out. At ideal it coughs and sputters and will die. So far this is what I have done. Replaced reeds with new boysen reeds -- new stator -- compression is good and even -- disconnected the VRO -- checked the fuel lines for and cracks or holes -- rebuilt carbs

I am just out of ideas as to what could cause this. It will jump and go and runs really strong just will not ideal with out coughing. It sounds like a lean condition but I just cannot figure out where it is coming from. Any ideas would help.

 

[Dhadley]

Re: 1991 225 Johnson Help

Sync n link is critical on those motors. If anyone has tried to set the idle using the screw in the throttle arm you have to start all over and go by the book. You also have to set the idle with it warmed up (out of Quick Start) and in the water (it needs backpressure).

You also have to make sure the bottom carb on each side is getting the throttle plate completely closed. There's an adjustment under each middle carb going to each bottom throttle body on the throttle shaft.

Once all the butterflies are completely closed you can start the sync n link. If it still is sucking air look at the side plates on each carb. It'll help if you can isolate which cylinder it's happening on. Remember the intake is an X intake on these motors (top starboard carb feeds top port cylinder etc).

Obviously we're assuming the carbs are clean and set properly, it has the right spark plugs and it has fresh 87 octane. And the air bleed jets are the original ones in the right places.

 

[dsinger]

Re: 1991 225 Johnson Help

Thanks I think I will try and start completely over with the sync and see what that does.