I HAVE had carbs off cleaned them and still half throttle is all it will do runs fine until you need more speed then like rear carb shuts down , what can I do .is it not carbs? I even changed rear carb it stopped the popping bucking but now bogs when you try give it over half throttle
IIf it is not fuel system, not fuel / air balance might be ignition system or wear and tear in the engine itself. Assuming the brakes are set up correctly and not dragging. Is the ignition timing correct. Is the compression okay? Cylinder head condition. spark leads good? Sounds like a trained mechanic with some diagnostic equipment might help you track the problem down.
Good Luck with it
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