Mowerfreak, you could be on the money there, when I started this it smoked the shed out in a couple of seconds, (always a good idea, the spiders don't like it in the shed) it obviously had a lung full of oil in the crank, probably fuel left on, and drained into crank and petrol had evaporated out. Anyway I started it a little while ago and I didn't hear the noise so it may have been the problem, but it wasn't at high revs, just at high idle
