what your missing? them plugs might be for electronic ignition. many old tractors were .025. i have changed piles and piles of plugs in all kinds of engine. when you get the correct plug there is no way they vary by .010 gap. only maybe a couple thou. years ago oldsmobile had a gap of .080 and that is what the gap was when you replaced with new plugs. i always run a guage threw new plugs. if the gap was .060 that is what the plugs were. i have yet to find gaps being out that much for the correct plugs. whos plug is that AL405? and yes plugs are pregapped.
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Today's Featured Article - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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