Bought a neglected 90 K75s several months ago as a parts bike. Bike had 39K showing, had been knocked over in a driveway. Had broken fairing pieces that had been removed. Bike was banished to the backyard where it sat in the Arizona heat for 10 years.
Didn't run when I got it but it had a Straintune exhaust that I wanted to hear. I puttzed withnthe bike, (used fuel tank I had with an old pump), had the injectors cleaned, and it fired! Actually ran pretty well.
Over the past months I replaced all the fuel related and small rubber engines hoses.
Yesterday, I replaced the main wiring harness (all the connectors that had been exposed to the sun had discentigrated) with a harness I bought on eBay. When I was finished, I put the key in the ignition rather apprehensively, turned the key to the "ON" position...No smoke leaked out. Hit the starter button, Bingo..Bike turned over a couple times..started and idled perfectly.
I was very happy.
I've recently found another k75 parts bike this one is a K75c. All of the painted parts from this bike will go on the other one. Evetythin I don't used will go up for sale.