LIT-18616-00-52 is Yamaha's part number for the manual that covers the 1988 Wave Jammer, model code WJ500G. The same volume takes in the 1990 and 1991 model years too, and alongside the Jammer it documents the Wave Runner and the Wave Runner LX.
Grouping them made sense to Yamaha at the time, and it works in your favour now: one book answers questions about three closely related craft across several seasons.
The content is straightforward service material. Removal and installation procedures written in the order the factory intended, tightening torques, service clearances, the wiring diagram, and the fault-finding steps for engine, fuel and electrical problems. On a machine this old, having the original numbers rather than someone's recollection of them is the difference between a repair that holds and one that comes back.
Keep WJ500G and the part number together in your notes.
