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Marty, provided the flywheel is on the correct spline so when the Left Cylinder is at TDC the Flywheel's Left Hand Impulse timing mark is at 3 o clock in line with the flat mark on the tractors side,,, and the crank to cam is in time,,,,,the governor gear to cam needs to be timed so at the Left Cylinders TDC (Flywheels LHI at 3 0 Clock per above) the female drive slot on the governor shafts end (where mag fits into) is flat horizontal fore and aft. Thats so regardless of which side any governor to cam gear marks are. The tractor originally came wired with the Mags Top Cylinder cap tower wired to the Left Cylinder and bottom to the right. However, with a non reduction gear drive mag like the Wico C or XH series and others, if the mag were installed into the governor 180 out (it fits into the governor either way) it will still run if the top n bottom plug wires are reversed. If the wires are wrong, it will pop n bang n backfire n maybe spin the flywheel backwards etc., which a wire reversal (or remove mag and rotate it or flywheel 180 and reinstall) will cure. Thats all so cuz the non reducton drive mags (like Wico C or XH) fire at BOTH the Compresion and Power Stroke TDC's and run at crank RPM. Thats why you were told it makes no difference, but it really still does in a sense. If wired wrong she wont run but a simple wire swap will make those types still run (or remove and rotate 180 per above). If you want it as original, its top to left n bototm to right, however. Once the mag is installed (after governor to cam timed so the drive slot is flat horizontal fore n aft at left cylinders TDC and LHI at 3 o clock) you set the initial start timing by rotating the mag CCW to advance or CW to retard and set it to where it just snaps to fire as the flywheels LHI mark passes by the flat mark at 3 o clock. To do that you can initially rotate the mag as far retarted (CW) as possible,,,,, ,,slowly turn flywheel until the LHI is at 3 o clock and stop,,,,,advance the mag timing (rotate CCW) just unitl the spring trips and stop. Then fine tune by observing the flywheels LHI and adjust the mag so it snaps just as LHI passes 3 o clock. If too soon before, it can kick the flywheel backwards. SUMMARY: When Left Cylinder is at TDC,,,,, ,flywheels LHI mark is at 3 o clock lined with flat mark,,,,, ,,governor shaft ends female drive slot is flat horizontal fore n aft,,,,, ,, the mag should snap and fire the left cylinder. If original, that will be out the caps top tower, if the mags 180 out, a wire reversal will allow them to still run as that mag fires at BOTH TDC's amd runs at crank RPM. Just have the flywheel on correct and at the left cylinders TDC and the flywheels LHI is at 3 o clock,,,,set the governor down on cam gear so the drive slot on the shaft end (where mag fits into) is flat horizontal fore n aft SIMPLE AS THAT I hope this answers your question plus explains the hows n whys etc. Hopefully, others will offer other tips n opinions on mag timing also. Post back or e mail me at [email protected] any questions. Good Luck n God Bless John T Nordhoff in Indiana
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