On the starter itself? On the starter motor solenoid? On the starter motor relay?
Start at the starter motor itself. Jumper battery power and ground directly to the starter motor. Using suitable sized battery cables. Does the starter motor now crank the main motor? If not, it is the starter...
Yes, Yamaha expects the cylinder heads to be removed to gain access to the anodes.
Yamaha manuals are written on the premise that a maintainer has a basic level of mechanical ability.
If someone needs detailed step by step instructions as to how to remove and replace the cylinder heads and to...