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may correct your Engine Trouble 



When you bought your tractor, it had two or four 

 spark plugs already in it. Naturally, the manufac- 

 turer selected those plugs to meet "average condi- 

 tions" — that is to say, those plugs were supposed 

 to work with any kind of fuel and under any idling, 

 light, medium, or heavy field load. 



After those original plugs have served their time, the problem of replacement is yours. 

 You will find approximately eight Edison plugs available, ranging from "cold" to "hot." 

 Any of these will have the proper thread size. A mere "fit" is unimportant. A truer 

 guide is "heat range." By that we mean, if you use gasoline, select a "cold type" plug 

 with a short, quick-cooling porcelain. If you use tractor fuel or kerosene, the spark 

 plug should have a long, slow-cooling porcelain. ' t 



To be absolutely sure — examine the condition of the old plugs. If the porcelain or 

 electrodes are prematurely burned, blistered or broken, you should use a colder plug. 

 If they're fouled, you should use a hotter plug. Consult the Tractor Spark Plug Chart 

 before buying new plugs. Your truck salesman has one. •• 



After 200 hours, adjust spark plug 

 (taps with a magneto wrench (tauge. 

 Consult your Instruction Book to 

 determine the correct clearance; 

 25/one-thousandths is the average 

 recommended clearance. 



When making gap adjustments, 

 always bend the side electrode — 

 never the center one, as the least 

 bend or twist may break 

 the porcelain and 

 causea "short circuit." 



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