Casting tech used on the heads wasn't good enough for the design. There was several head changes on some of the head numbers trying for better sevice. Some heads had 7 or more changes for the same head #. For some reason some heads lasted, so if you have one not cracked thats saw a lot of use there's a good chance its a better casting or took care of. Back in the day a local construction dealer would get new machines with cracked heads when unloading or before leaving the lot. Lot of good ways posted to help the heads last. Make sure there's gas and a good starting system to restart tractor if engine is killed when hot. Don't overload and keep the cooling system in top shape.
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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