We have a 1969 Case 220 tractor with a Kohler engine, which is basically only used for mowing, using an attached mower.For the past several years, the tractor has routinely run only 35 to 45 minutes at a time, then stalls. This year, the stalling occurs after only 15 minutes of operation. After the tractor sits and cools down for an hour, it will start, and then run for a similar length of time before stalling again. This occurs both in mild and hot weather conditions, and in both light and heavier grassy areas. The tractor is always operated with the throttle wide open, and the stalling occurs regardless of the amount of gasoline in the tank. Changing the spark plug makes no difference. To the best of my knowledge, the fuel mixture adjustment is set where it should be, per the owner's manual. Since mowing our property is a 3 hour job, doing it in increments of 15 minutes mowing, one hour waiting, 15 more minutes mowing, another hour waiting, and so on makes buying a herd of goats look ever more appealing. In lieu of that, I hope someone can share some thoughts on the cause of the stalling and what can be done to correct it. Whenever we've tried to have tractor service performed, we are always told, "It runs fine for us." Obviously, they are not experiencing what we are experiencing. Thanks in advance for any help you may be able to provide. Mike
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