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A simple trick to keeping the FT-817 cool while running 100% duty cycle modes like JT65, PSK31 etc. You can get away with 5 Watts safely. The finals should be ok with the duration. They are 2SK2975 MOSFETs. From the spec sheet, they are rated at 10W dissipation when mounted to a heat sink.
Obviously you still need to be careful. Back to back digital QSO's in a contest could still heat it up over time. If you burn it for an hour straight and blow your finals, don't complain to me! (wink).