For my 1992 Nighthawk 750 SC, bought used, it is my guess that there should be routine valve adjustment maintenance for the bike. Are they self-adjusting, or perhaps hydraulic lifter valves, and if so, do they need some sort of routine adjusting?
If you are close to the up state of South Carolina....there is a guy on greenville Craiges list with a 92 hawk 750 for parts.......350.00$.......looks good but the seat.
Thanks for the heads up...love those kind of leads, but I'm sitting in snowy northern Vermont. However, I am thinking of doing carbs in the off-season---cleaning, synching. Got a friend who is a good motorcycle wrench and has the right tools. Is that a big job? He doesn't seem to think so, but I always like other opinions. Maybe I'll throw it up as a forum question...