Couple questions, I recently purchased a used John Deere 180c greensmower. It was serviced prior to me purchasing it and the spark plug was new among other things. In a case of bad judgement, I ran some old gas in it to get rid of it so I could refill my gas can with fresh gas. As I was cutting, it died while it was idling emptying the grass catcher and I couldn't get it to crank again. I finally pulled the spark plug and it was completely black. I was able to scrape the contact point with a wire brush and it fired right back up after that. My question is, could that have been caused by the old gas or do I have a bigger problem? Is there a way to adjust the mixture on the carb like you can do with a car if it is running rich or lean, etc? Any help is much appreciated!
SSE Dad
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I don't own a mower like that but I had a few thoughts that maybe could help. When you say the plug was black, what do you mean? Was it wet and shiny black? Or was it dry/dusty black? Sounds more like it was carbon build up based on being able to scrape the electrode off and start it again. If thats the case then its running rich, which I would see as more of a carb issue than anything else. In my experience bad gas will cause problems pretty quickly when using it, so with a small tank like on a mower I would imagine you would have had problems before you had to empty the grass catcher.
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