They have a resistor in the cap and sometimes this fails. I know this from personal experience trying to track down faults in old motorcycles over the years. Not sure if XT600's came from the factory with resistor caps but a PO could also have installed them. While I'm on it, best to replace the lead as well. the copper wires oxidize and corrode over time which also leads to poor spark. Make sure to use copper cable, not silicone. If it's difficult to find, try a marine store.
hope this helps!
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