Alex; If it starts fine when cold but not when hot it's most likely too rich on the carburettor. Back off, (anticlockwise), on the big screw with vertical grooves and try starting it with the throttle open fairly wide. From memory, (not to be trusted), DB instructions are to make sure valves and timing are correct and engine is up to operating temperature. Put spark advance halfway down, back off on said adjusting screw until popping occurs when the throttle is opened quickly, turn adjusting screw clockwise until popping goes away. I can't remember if additional clockwise adjustment is any part of the instructions but will pass it on if I find any useful information. If nothing else, try ht starting at full throttle with the fuel shut off. Nat
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