Well after the weekend racing and testing I have fixed the back firing of full throttle. As suspected, it was to lean on the needle. After a couple of needle changes everything came together. Still running a large jet 2mm. The main thing I learnt is before you go messing with the carb internals make sure the intake is not messing with your engine. Pod filter not enough volume, Trumpets no good to much length, open carb good. For my engine engine and carb that is. Airbox untested properly. The needle in at the mo is the one I started with! All the 3/4 throttle problems were intake related.
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