This is one of those perennial questions that pops up every so often with little agreement and no resolution. I use grade 5 bolts on my brush hog, which gets pretty rough service. I'd be replacing pins hourly if I used grade 2. Obviously softer bolts would be easier on the gearbox.
I try to avoid using grade 2 fasteners for ANYTHING. I like to think of them as "grade UNKNOWN", because you really don't know what you're getting when you buy Chinese "grade 2" bolts at your local hardware store. After all, a grade 2 bolt has no markings.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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