And it's my fault. During first use, transmission belt got knocked off the pulley. When I tipped it over to clean out the junk and put the belt back on, I tipped it the wrong way. The air cleaner and spark plugs were saturated with oil, which also leaked onto the ground. I cleaned the spark plug, replaced the air filter but it still won't start. Mower has a 5.5 HP Honda engine, if that makes any difference. Any suggestions how to get it working again without having to take it to a repair shop? The grass is getting pretty tall here!

SS

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with the spark plug out try turning it over a few times. there is still oil in the cylinder, and that is preventing it from starting. just remember to remove the spark plug from the boot so it won't spark.

 

You also made sure the oil was back to the full mark correct?