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Jeff, if the flywhel tends to kick backwards when you try n start it, the initial static start timing is set too fast (too far advanced) and needs to be retarted slightly. To do that, loosen the mags mountign bolts and rotate it CW. The start timign can be set by removing the plugs so she rotates easily and then bring the left hand cylinder up to TDC on its compression power stroke (you can use a wire etc to determine TDC). At that position (left piston at TDC), the Left Hand Impulse timing mark on the flywheel should be in the 3 o clock position in line with a flat mark on the tractors side and the mag should just snap to fire the (top terminal on many Wico caps if installed as original but regardless, the first leading terminal) left hand cylinder. If she fires too soon before the LHI flywheel mark reaches the flat line at 3 o clock and kicks back, retard her (rotate mag CW) but if she fires after the flat 3 0 clock mark, advance her (rotate mag CCW). Thats primarily for the non gear reducer driven Wico type C and XH series mags (fire at TDC on BOTH power and exhaust) which if set as original where the left cylinder fires first out the top terminal, and the right 180 degrees rotation later, Even if the mag happended to be 180 out on a Wico C & XH, the wires can be reversed to make her run even if it ends up the bottom terminal firing the left cylinder. On the gear reduced drive mags, they have to be right with the left cylinder firign first at its power stroke TDC and the right firign at its TDC power stroke which is 180 later. Good Luck n God Bless John T Nordhoff in Indiana
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