Freebird, I have cleaned the filter, primer bulb is working, I'll pull the carb but I don't expect it will fix it. He said he had another carby and would bring it over, see what that does. I swapped the gearboxes over from the 2 stroke to the 4 stroke, I had got the 4 stroke starting well, carby on that was loose and by swapping the gearboxes, got the clutch to hold . Anyway he just dumped it in the trailer, I said to him 4 strokes don't like being tipped upside down,shrugged his shoulders, anyway an hour later he rang me and said that it wouldn't start, I just said "I'm not surprised"