Hi John,

Go with the great advice already provided. I would echo liberator's advice and always have "something on the bench" that you can finish quickly if gravity wins the argument.

If the engine starts to quit when inverted and the high speed mixture is ok it is probably a tank position or a glow plug matter. If the tank is a little too high in relation to the carby this will still work ok until you try inverted with the tank anything but full. If the tank position and mix are ok try a new plug of the same range or slightly hotter.

Cheers,

Colin