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1 - Fit late model 2-part clutch star-springs and nut (from 94 and later models).
2 - Beef up the alternator chain tensioner
https://www.kwick.biz/product/tensioner-tamer-alternator-starter-chain-tensioner-fix/3 - Fit '95 or later model (or manual) cam chain tensioner.
Manual -
https://www.ebay.com/itm/KT1100-C-1986-2006-Kawasaki-ZG1000-Concours-APE-Manual-Cam-Chain-Tensioner-/3800125509124 - Replace the alternator connector with a better quality higher current connector (2 pole)
I used Anderson SB50 connectors on mine and 10 years on all good.
5 - Re-flow the solder on the relay joints in the J-box.
Finally, the 86's have a tendency to tulip their intake valves at around 120k miles.
If yer nowhere near that mileage, don't worry about it, but bear it in mind.
I also seriously recommend adding a flushing additive to the oil and getting the engine good and hot before you first change it.
These engines sometimes suffer from blockages in the crankshaft oil ways and that leads to oil starved big-end bearing and the piston exiting the engine.
I use a flushing additive every other oil change. Using a flushing additive often shows up worn out seals so you can replace those.