Some time back I changed my GP carb for a Mikuni VM36-4 carburettor. From the outset I have had problems with poor starting and flooding. Hoping to cure this I changed the float chamber needle assembly with a new one - with no improvement. The carb came with everything pre-set for my DBD34 Gold Star. A mechanic friend of mine said that the float height was wrong and re-set it to the recommended 18mm. The carb still floods and does not start so well now. Does the recommended float height need to be changed, bearing in mind the Goldie's downdraft head? Would be grateful if anyone could help. John
Does the flooding stop if you turn the fuel off? If so, it's the float valve.Note also that the float height is measured from the gasket face of the top of the bowl (usually with the carb help upside down. Basically, the float arms should be level. 18mm sounds about right +/- 1mm. It can be raised or lowered quite a bit more than that, as a simple test to see if the engine wants a larger or smaller needle jet.
No generalisation is wholly true, not even this one. Oliver Wendell Holmes