How do you tuneup a gl1100 goldwing?

New spark plugs, check the wires to see if they need to be replaced, new air filter, new fuel filter, oil and filter. That's about it, unless the bike was running bad before then more needs to be done. Like syncro the carb's, and timing. Have the timing belts been changed, pick-up's, thermostat, coolant, fan temp sensor, ( it usually needs to be replaced), that's about for now.