RE: Throttle hesitation
Either diaphram as above or the little bent over injector jet has crud in it. Also check that when you move throttle the lever pushes against the pump acuating rod and compresses spring. It should then fairly quickly even out as petrol is squirted up accelarating jet. One problem I had was a missing plug in the top of the carb. A hexagonal ish shaped plug was missing for some reason and it took a lot of reasoning to find it and wonder why it had gone for a walk. Cheers Nigel
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