I don't think it would be possible to "copy" someones current engine production unless there was inside information being leaked.
It takes years to develop and test an engine.
They always start with an undersized displacement, an over built bottom end, then start increasing the output as a marketing ploy and continue to increase to the max the bottom end will stand.
While this is happening, they are developing the next generation of engine.
There probably is a degree of spying and employee exchange going on, and it's impossible to keep secret what works, and especially what doesn't!
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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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