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Mornin Mike, The first thign I would do is remove the plugs and have their plug wire attached and them up against frame and turn the old girl over slowly and observe the spark at each plug to see if they are about equal in quality and a good blue and NOT a thin wimpy yellow spark. If one side is weaker, swap plugs and wires to be sure that one side is always weak or if its a bad plug or bad wire causign the problem. A leaky plug wire or a fouled plug on that one side could be the problem. Be sure its neither of those first. What kind of mag is it????? ? If swapping plugs n wires shows its always only one of the mag towers that has a weaker spark, the same set of points and condensor and coil fires both, so I would suspect (if its a Wico Mag), a problem like a crack or carbon path or oil residue in the cap, or a rotor tip problem, or possibly even worn rotor shaft bushings causing shaft wobble or uneven high cam lobe lifting. Remove the cap and clean and inspect it and check the point gap on high cam lobes. If its a Wico, be sure the lil spring goes back and makes contact with the coils side output button/terminal. If the points are gray oxide coated but otherwise smooth and not pitted, try to clean/polish them and re gap, but if badly burned or pitted or black carboned, replace them. Are the plugs looking about the same and are they both a gray color????? or flat black sooty deposited (excess unburned fuel) or uneven wet shiny black deposited (foulign and oil burning and gas) The compression isnt as important as both sides being close to the same. Does she black or blue smoke out the stack much???? or have excess blow by out the crankcase???? If that one bad side has way lower compression and the ignition checks out, you might remove the rocker arm cover and check the valve lash settings for potential leaky or burned valve cuz it didnt have enough lash clearance. The initial start timing is set by loosenign the mags mountign bolts and rotating it CCW to advance and CW to retard. If you can see the flywheels timing marks, when the Left hand (flywheel side) cylinder is at TDC on its compression power stroke, the Left Hand Impulse mark on the flywheel should be at 3 o clock in line with a flat horizontal mark on the tractors side. Just when the flywheel passes that mark is when the mag should snap and fire and adjust it per above. The run tinming is around 20 to 25 degrees advanced, and its setting depends on the type of mag you have often set on some by loosenign screws on the rear (where it mates with governor) and rotating the plate. Thats enough for now, so post back your findings and we will proceed from there. John T Nordhoff in Indiana
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