Gosh this is mega confusing. Those service bulletins are tough to follow in parts.
My G4 is going to have to be given the forensics before deciding what bits to chose for final assembly.
I notice it's poppet valve has no abc markings, so does that mean you just put it back in any position?
I discovered that the reason there is no throttle control ( and the motor doesn't stop) is because the cable outer has broken from corrosion. This is why the lever was moving normally but no action with the cam downstairs.
I'm still glad to have pulled out apart as the carburettor has admitted all this gunk mainly made up of rust scale, so this is a great opportunity to clean it all out and see how it runs when put back together properly, with another throttle cable scabbed from a waterlogged power torque.
