Those old Hondas were some of the best (though ride has always challenged Honda).
I have a 98 300 2WD TRX which still runs after at least 30,000 miles and hauling some rack-straining loads in excess of 500 pounds.
Don't work it wrong, keep the RPMs up (so clutches aren't slipping/chattering) and these old machines will 'haul some serious mail'.