Yep - Its covered in the Haynes, needs to be able to have bike running from memory.
Plug fouling..dunno about 750 - always worth check grade of plug as there are variations between different manufactuers grades.
I had good success with a NGK Iridium plugs until one went bad
Checkin gthe needle heights is a good plan but a bit of a pain as it entails removing the airbox etc etc etc etc etc etc
Choked air filter might be a suspect as well.
Good luck