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Dirty spark plug & oil.

I have a B&S 4-stroke lawnmower. The spark plug gets incredibly sooty after just 10 minutes or so of running the mower. I clean the plug, replace it and 10 minutes later (if that) the mower stops and the plug is dirty again. I strongly suspect I had too much oil in the mower so I replaced the oil with about 50% of what was in there before. After less than 30 minutes the new oil was also very black. Can you give me some tips to fix these problems.

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Posted on Oct 06, 2009

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You can fix these yourself, all you have to do is to follow the instructions below,
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2 If your lawnmower is a "four stroke" mower (separate gasoline and oil), tip the mower so that the spark plug is pointing skyward. Never tip it on its side with the spark plug to the ground.
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1 Answer

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