I used to shut down the 110 at 55, never really topped it out, usually the speed limit was 30 or 35 where I was trying WOT. Of course that was over 100 lbs ago.
I think the carcasses are mostly complete '71 and '70 or so , both yellow.
I joind a yahooo group that does the lifan swap- to 12 volt, footpeg kits etc. Could have a new motor for either of them and 12v for under $500 and some time.