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Found a 1986 Yamaha FZ600 for sale. Going for $800.
Some of the Yamaha motorcycles that came out in 1986 are: FJ1200, FZ600, FZ750, XJ600, XJ700, XS400 and YX600. The YX600, also knows as the Radian, was the most affordable at that time.
The FZ600's have an air cooled engine, and I think the Fz's are the only one's at the time that came with an oil cooler.
go to yamahaclub.com, there are plenty of experts on there that know everything about the older fz's. I believe the gapping is supposed to be.... from .7mm to .8mm. I would suggest NGK plugs too, made for performance!
buy a manual, they usually will have them in depth in the back somewhere (at Least Haynes & CLymers do.). they usually only run for about $20 and are well worth it, giving lots of other helpful stuff too.