All the Hondas of that time were service every 1500 miles Ted until the Wings came in.
The service schedule is in the manual in Ash dropbox with every 1500 jobs, then every, 3000, 6000 and 12000.
From memory the 12000 is just about everything has to have oil change, all the filters, carb balance etc, if we had ever done an official 12000 srvice it would have cost an absolute fortune, i think it was quoted at 8 hours work