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Good Morning Ken, I will try and un confuse things a little and hope it helps out. You have all the correct basic information below from clooney and steve, so here is a little more info to try n help you. Remember that the mag turns at crankshaft RPM and in the same direction. Also, the pistons are 180 opposite each other, when ones at TDC on top, the other is at the bottom of its stroke and back on top 180 later 1. As far as the left cyliner firing out the top mag terminal: For that to be so, the mag has to be installed so that at TDC on the Power Compression Stroke of the Left hand Cylinder, the Left Hand Impulse mark on the flywheel is at the 3 O Clock position and lined up with the mark on the tractors side. 2. NOW, if the mag is in 180 out, a simple reversal of the top and bottom wires would make her run BECAUSE if thats so, it would be the BOTTOM plug terminal that fires at TDC on the Power Stroke of the lefT hand cylinder. 3. The Wico C and X Mags fire at BOTH the TDC on BOTH cylinders Power and Exhaust Strokes and it came from the factory wired and timed so the left hand fires out the top terminal at TDC on its power stroke at Left hand Impulse flywheel mark at 3 O Clock. However, since it fires at TDC on BOTH strokes and the right cylinder fires 180 after the left, its possible if its in 180 out to reverse the wires and make her work. 4. Like clooney told you, it will NOT run if its in 180 out and the wires are not reversed. If in right, the top cap terminal fires the left cylinder and bottom terminal fires the right 180 later. HOWEVER, if its NOT in right it will NOT run UNLESS the wires are reversed. 5. Some other brand of mags fire at only TDC on the power stroke and not the exhaust stroke, so most of the above would not apply in this situation. 6. Finally to answer your question as to whether reversing the plug wires accomplishes the same as turning the mag 180. In theory and if there are NO differences in the cap or rotor or terminals or cam lobes, the answer is YES. However, due to possible slight differences in the cam lobe wear, the cap and rotor terminals condition and their exact locations etc., it may be possible that one side has a different spark than the other, but it will still work. Good Luck n God Bless, hope this all helps and we havent cornfused you lol. Ol John T Nordhoff in Indiana
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