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Various methods - check spark plugs often, read them. I usually pull plugs for inspection while changing my oil... good task while waiting for everything to drain.
Watch AFR and EGT. There are open-tip EGT probes that will give you faster swings than the old closed tip found on VDO systems of yester-year.
Listen to the engine, pay attention to the feedback it gives you in sounds, smells, and most importantly the seat of your pants. If the operator is familiar with the machine then detection of issues is easier than you might expect. The more time in the seat, the more you'll learn the sound of it's voice and be highly sensitive to any changes with or without a knock light/timing pull.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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