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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204 Posts
Id be skeptical that bad gas could or would foul a plug. I would say that the carbon you saw was more likely a result of it dying and you not being able to get it to crank again. If you crank and crank and crank the engine and it wont start, it can absolutely foul a plug because youre dumping fuel into the engine but there is no ignition to burn the fuel away, so it can sometimes foul the plug.
Especially with a 4-cycle engine, you can easily foul the plug that way.
Especially with a 4-cycle engine, you can easily foul the plug that way.
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