It is possible. The cam shaft would need to be cut and rewelded (very straight and precision machine work) so the 1-4 valve timing is the same, and 2-3 timing also re clocked. Three cuts would be needed in the cam to make this happen. The timing would be such that 1 and 4 would fire together, then 2 and 3 would fire together, but like a JD it would be put-put, pause-pause. Ignition would be easier in that a single electronic trigger could be used to switch 2 cylinders at once. Some electronic fiddling would be needed. A JD distributor, and electronic trigger? Problems would be really nasty impulse over stressing of the crankshaft. Especially at the 3-4 area as 3 and 3 twisted on the #4 journal and at the rear main when 1 and 4 fire together. Twice the cam shaft loading is also happening as the cam opens 2 valves every time the lobes come around. Clutch stress and drive line stress would also be an issue to contend with. Doubling the torque instantaneously on the components is not wise. Intake systems and exhaust are designed to handle flow for one intake per 90 degrees. Not twice the amount, as would happen when 2 cylinders sucked air/fuel at once, and two exhausted at once. Much easier to ground #4 and #2 plug wires, and remove the rockers on them. Jim
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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