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If not #2 then perhaps an overheat and piston/cylinder damage. Rap is probably rod bearing or piston slap. After shutdown, temps can spike which would explain the seize. Hill climbs can be rough on engines with no cool down. If you shutdown after a hard run then ideally let it sit for ~30mins minimum before attempted startup again. This allows temperatures of the engine components to equalize and dissipate.
If you are equipped with an after-run auxiliary pump then these instructions don't apply. For a racer with frequent shutdowns throughout the day when hot, such a pump might make sense as a retrofit. Most OEMs run the auxiliary pump to off the head into the heater core... Useful for cabin heat in the winter without the engine running as well.
I'm just rambling now...need coffee.
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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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