Re: Needles. How they do?

Graham Motzing /
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Yeah the other thing that I learned way too embarrassingly late was to think of it like a reduction to flow rather than adding flow. It sounds kind of stupid/obvious but the needle is really removing flow at part throttle when you have high vacuum and are cruising it doesn't add flow at low speed high load.

The secondary air circuit or pilot jet circuit is making up for situations where you have large throttle opening and low speed AKA high load but it would deliver too much fuel with the throttle closed at higher speed and low load so you need to add fatness to restrict the fuel. If you think of it as adding fatness rather than adding fuel it will make a lot more sense when you are riding and feeling how the bike behaves.

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