Hey Andy. This looks like a float valve jet size problem. I could be wrong, but it's worth a try. I've seen it before, not on these carbs,but with Webers. It might be worth putting a jet gauge in there, just to be sure. Those jet and emulsion tube sizes should be well sufficient for the job ! Good luck with it. Chris.
Interlock plate wrong way round in gearbox? I put my one in wrong way round still worked but notchy like yours! James noticed it when he did my crown wheel and pinion.
Shrigleytube TV ep 171 1012cc on hub dyno, FAJ’s go lean too end ??
ShrigleyTube (Andy Jones)
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short week for me, not helped by having a few issues!