1976 Z900A4 Carb issue

[Oddjob]

The problem is Ted is that you cannot do anything to the needle to alter the mixture, it's the clip that you move not the needle. So you move the clip downwards to richen the mixture and move it upwards to weaken it. Any terminology that mentions moving the needle is the wrong terminology.

[McCabe-Thiele (Ted)]

In my head I visualise the slider half way open - at this point the taper of the needle is allowing an amount of fuel to flow through the gap - between needle & jet.

 Lowering the needle relative to the slider will reduce fuel flow as the gap is smaller - thus weaker mixture.

I'm just confirming that I overthink stuff I guess.

[K2-K6]

In my head I visualise the slider half way open - at this point the taper of the needle is allowing an amount of fuel to flow through the gap - between needle & jet.

 Lowering the needle relative to the slider will reduce fuel flow as the gap is smaller - thus weaker mixture.

I'm just confirming that I overthink stuff I guess.

I've always seen it tbe same as you Ted, with conversations like "we'll drop the needle on that to lean it off" and visualised as, for whatever air the slider is giving, then needle down gives less fuel, lifting needle gives it more , for the same air.