Another reason to check the Vin, is that really an 86 model, cause no way is the instrument cluster from an 86 model, so then we have no idea about the mileage being genuine. The cluster looks more like from a k1100 but the bike is a k100 2v. It's a bitza.
I'm guessing it's been someone else's parts bike, and maybe a 91 or newer cluster.
Any brick could still be a bargain, as long as your offer makes it one.
An 86 cluster should look more like this: