They already mentioned the water pump(also the same w/ a CX500)especially if it's been sitting for a while it may have corrosion around where the shaft meets the seal but hopefully you just need a water pump seal.
in 07-1994 at 58.000 km, their was an engine (down to the crankshaft bearings) and gearbox overhaul. That water pump oil-seal had been replaced.
Odd, they had to replace the oil pump but I cant find the water pump on this invoice.
Bike then got another 5.000 km on the clock and than had been de- registered at 63.000 km in 11-1995 and put into the shed.
Service book is complete, every 3.000 km serviced. Unfortunately I don't have all the invoices so I cant check, if their was any repair on the strator yet.
Hope I have luck with the water pump.