So lets give you a break and say $275 for this ped anywhere in the US.
times 1.6 San frandisco tax
and lets go ahead and add $100 because you went through and fixed any little problems, replaced cables and tubes, maybe even tires.
oh yea and lets go ahead and add the $18 for Registration because you registered it right?
and ya know what I'm a nice guy, I lived in San Francisco, I like mopeds so what fuck I'll throw you an extra $50 because it runs like a fucking dream and the top end looks like new, you even pulled it off and checked the rings and cylinder. because for $1300 you surely have gone over this thing and made sure it's in great shape mechanically.
$608 because you did all of the above right?