A couple of weeks ago while I was mowing the lawn with my 12.5 hp Yarkworks lawn tractor for some reason the machine started revving really fast. I turned off the ignition as quickly as I could. I then went to restart my tractor. However the machine would not turn over until it cooled down. The symptoms haven't changed. I can mow the grass for hours as long as I don't turn the machine off. Then I must wait until it cools down again. Someone told me I may have a warped head since the machine revved like it did. Help.
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You could have a problem with your medal expanding when it is hot. You will need to check the spark when it is hot. You could also have a problem with a coil or wiring. Also check your carburetor it could be full of gunk. If you dont know how to clean the carburetor you should take it into the shop.
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