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Don't take this as a definite but, from my fairly recent work on the carb from my honda dominator, which is a similar diaphragm carb, I think the small, spring-loaded diaphragm on the side is a "coast enrichener", whose purpose is to reduce any tendency to pop and bang on the overrun.
And while I'm posting .. are you aware of Allen's Performance as a source of carburettor spares ?
I've had decent service from them, as have other forum members.
They seem to keep a good stock of jets and other carb consumables.
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