Throttle MUST be open all the way or the engine will not get all the air possible to compress for an accurate compression reading. Can you breathe very well with your hand over your mouth? Count the same number of compression strokes for each cylinder. Re-test with a few squirts of engine oil in each cylinder. Don't run the battery down or the slower speed of the piston will give inaccurate readings.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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