Well after pulling the starter cord about a thousand times I gave up, out of breath and totally discouraged. We all get flustered! Especially because it is time to cut the grass and our time is somewhat limited also. So I say "cool down", take a breath! The steps taken from here on in are the most communally taken. The next steps are important to try and figure out what is wrong with the garden equipment.
Well I would take out the spark plug to see if it is wet for one thing; at least that lets me know if the cylinder is getting any gas at all. The spark plug looks pretty wet! Mm-mm must be getting gas. Is it time for a tune-up?
If you had this lawn mower for more than ten years it is probably worn out. It's hard to for me to judge, however small engines are based on running hours which are about 5 thousand hours. Now that does vary of course on what make and model you have. Overall that is a golden rule. A tune up does not hurt it at all and replacement parts are probably needed by now. The important thing is giving more life to your lawn mower through constant maintenance.
Setting up the air gap on your spark plug does help or replacing it all together is your choice. In my opinion and experience, I have been using the same spark plug for over three years now with no problems. On all small engines you have a cold start! That is from the cylinder compressing the very first burst of fuel received from the intake stroke, drawing air through the carburetor mixing the proper amount of fuel and delivering it into the cylinder.
There is a simple system however that allows extra gas to be delivered of and it is called a choke plate. This choke plate is sometimes over looked as it may not be closing properly at all and can cause the engine not to start. It should be examined to see if it is not bent or out of shape.
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