As long as the rotor is tight enough to be generally pointed towards the electrode for the proper cylinder, looseness will have absolutely no effect on timing. The timing is determined by rotation of the cam, which is not driven by the rotor. The absolute rotation position of the cam will be affected slightly by wear in the valve train and gear reduction of the battery ignition unit. However, any change due to wear of those parts is compensated for each time the timing is set.
By the way, the spring built into the center contact of the rotor keeps it in place as long as the cap is on. The only time a loose rotor can hop off is when the cap is removed.
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Today's Featured Article - Product Review: Electronic Ignition - by Staff. Oil, for example has come a long way in the last 50 years and I don't use anything but the latest API grade available. I've heard the arguments for non-detergent oils but would never trade it for today's formulations. Paint is another, the modern acrylic enamels are great for resistance to grease and fuel stains, retaining their shine and they last forever; unlike enamels and lacquers . Still another is the alternator. No doubt using the original generator keeps the tractor pure, but for thos
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