Had another one come back yesterday, broken pawls on the pull starter. Ok this can happen I guess, put another top on it and I went to prime it and it wouldn't prime. Was about to change the fuel tank/carby when I thought I had better check the fuel. Put some fuel in it and it started first pull. Obviously he was pulling the Poo out of it trying to start it with no fuel in it. I do deal with very low level people most of whom should not be mowing their lawns
