Well, I flushed it out until there was no longer any trace of the contaminant, whatever it was. It starts and runs fine and, worse yet, I've already sold it! I did tell the guy to bring it back if he had any trouble but he lives in another town about 3-4 hours away. They come to Mackay pretty often so I am sure if it comes to grief I will be seeing the mower again. Is this what they call a vicarious liability?