In my state, he'd have to get it inspected within three days of registering it - and without a functioning front brake, they'd put a FAILED sticker on it, and he'd have to park it within three days of that.
I'm guessing the only reason that the seller is holding out for $800 from the OP is because the OP appears to be so interested. Figure that bike - with a clear, valid title and no liens or other financial boat anchors attached to it - would be worth $500-$600 in its current condition. Deduct the $371 that the seller stated it'd take to straighten out the paperwork
if it turns out to only cost that much, add however much it would generally take to transfer a title in your state if everything was hunky-dory (I've heard it's a pretty criminal amount in CA, but IDK), plan on eating the bill for the time/hassle you'll end up spending dealing with the paperwork because you slipped up and allowed the seller to discern your interest level, lol, and whatever number that gives you... show up with that amount in cash, show it to the seller, and either leave with the motorcycle or just leave. Either way, make that your one final contact with the seller.
Surely, for not much more than the $800 the seller is demanding plus what he states it'll cost to deal with his failure to get the title legally transferred to him in the first place (or whatever the problem is), you could find a motorcycle (even if it's not a Honda) in safe/legal condition, a "trip ticket" (they're really cheap) that would give you the legal right to ride it home, and a bus ticket to pick it up, lol. I wouldn't want to spend 24 hours on a Greyhound (because I have

), but that opens up the search area considerably. If you have a truck, you could even venture into areas which are cold and snowy right now and, perhaps, find a real deal.
Just ramblin',