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One thing I've experienced, that may be relevant, is that ICMs (Ignition Control Module) generally have an internally programmed threshold, below which they will not create sparks. This is right around 10V. If system voltage goes below that value, ignition doesn't work, so a bike with a high resistance battery, or one with a bad cell, may still crank but won't fire.
Lead Acid technology in small motorcycle batteries generally last 3-5 years, on average, but can fail much sooner if something is out of whack.
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