I take it your not talking about the highlighted section as that referring to the kill switch set up.Now what the spring section (14A,B,C,D and E) is referring to,basically is about the spring in the diagram marked as 14.Different model mowers had different tensions of springs. Now where it has the colour ie. Green clear yellow etc is referring to the colour that the spring had painted on it.
So I'm not sure that there was a real lot of different's between the different coloured spring tensions.As I've found that spring manly is there to push on the diaphragm to allow the engine to have some kind of idle.
Now you've set the topic as G4 as far as I knew G4's had the same spring as due to an idler screw knob on the outside of the carby you could adjust the idle by turning that.
So (and I could be wrong) this is more referring to an LM carby.
I guess the question is what size engine is the carby for?
Maybe someone with a little more expertise can work out which one is required.As I'm better with the G4 specs not some much the LM. Not that there was a lot of difference.I guess Bigted would certainly be better with that.
I hope that helps a little bit.
