Originally Posted by flymike
Therapy, you were right. It did run better with the choke out - I never would have thought of that. It looks like a carb rebuild
is coming up!
Without being there I would think that the high speed jet is clogged. How does it idle? Usually it is the low speed jet (smaller) that clogs and it runs OK but stalls at idle.
Either way I have not had to "rebuild" for clogged jets.
Just take them out (if possible) and soak them in carb cleaner or "Sea Foam".
A couple of times when the symptoms were mild all I do is load a 60cc syringe with Sea Foam and squirt it into the air intake with the motor
running - till it stalls. Let sit 30 min. Start up and see if that was enough. Warning - It smokes A LOT and neighbors will think your garage is on fire.
This works if it is build up of the junk that accumulates from evaporation. If your fuel lines are breaking down then there are little rubber chunks in the jets. These must be coaxed out using soaking and compressed air. Then of course change the fuel lines.