No, me neither.
My Grandad had Reliant Robins. He reckoned his 1982 model with the yellow-top 850cc engine would do and indicated 100mph. He never rolled one. I drove his last one to the dealer after he died and gave it a bit of a caning. I got it up on two wheels a couple of times, but once you learnt (quickly!) to predict it, you could corner surprisingly quickly :-) I only got 90 out of it though
My brother's just cut the floor out of an old Robin to rear-mount a CBR600 Engine in it. I know Burgerman said get a GSXR1000 motor, but the CBR was free and will do for now :-) Pics of the build to follow shortly..
Should be ok with a nice fat tyre on it.
Mike P