1986 Yamaha MAXIM X Service and Repair Manual
The 1986 Maxim X is coded XJ700XS, and its factory service volume is Yamaha LIT-11616-XJ-00, the same reference that serves the 1985 machine.
Two years in one volume
Yamaha covered the 1985 and 1986 model years together here. Anyone comparing the two seasons can do it inside a single document, with year-specific details noted where they apply rather than left implied.
Work through it the way a dealer technician would. The procedures are sequenced, the fastener torques are specified, clearances and adjustment settings are stated as figures to measure against, the wiring diagrams map the electrical circuits, and the troubleshooting sections narrow a symptom down to what should be checked.
One last step before you start: read the code on your machine. If it says XJ700XS, LIT-11616-XJ-00 is the correct volume for it.