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 - Recollections of a John Deere GP - by Charlie Cook. I grew up on my dad's 280 acre general farm in Western Michigan. Dad's only tractor when I was very young was the old GP. My first recollection of this tractor was when dad allowed my brother and myself to ride on the tractor with him driving. One of us would sit on the left fender (away from the clutch) and other would sit on the gas tank and hold onto the crankcase breather pipe.
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