25 hp 2 cycle johnson 1999 starts idles..kicks then dies?

Question

once in gear engine runs fine...high speed ok...return to load boat on trailer idles rough..kicks and dies..restart and the same..engine decarboned..top cylinder( plugs removed) fouled wet plug...any help appreciated

Answer 1

I would check the float height on the top carb (assuming that's a 2-carb model, don't remember).  my guess would be the float valve isn't seating completely, #1 is running rich not enough to tell at hi speed but enough to flood at idle after a long run.

been a long time since last carb rebuild, this might be the time.

Answer 2

Take it and get the carb. clean and adjusted

Answer 3

I would think Carburation.

1.check throttle stop adjustment s***w is allowing slide/needle to shut of fuel to much at "Idle"

2.Oil on spark plug,check oil/petrol ratio is correct

Answer 4

the carb, maybe needle &seat