No Rog... you have jumped to a conclusion... you don't get into the record books unless you set a NEW record.... so just because the record is 20 years old doesn't mean that people are not TRYING... they just are not BEATING the old record.
In other words... thise 'old' records are damn fast.
(but I will agree that not a lot of people try for 50cc records)
And.. take another look at them... the ones with the letter "F" in the description?... are running Fuel (like nitromethane or alcohol)
See the PP record in '95'?
I know her dad (he builds the bikes for her)... they own about 7 Bonnie records total now.
By the way... you didn't offend me at all ... but people tend to make wild claims all the time about speed and performance... I like to find the truth.
And I suspected that what you were talking about WERE 50cc bikes.. and they DID go near 90mph... but they all have big bore kits on them.. so they are not 50cc any more.
(I have not checked your link yet)
The point is ... you will never see 50cc scooters or mopeds going 90mph.. or even near it.
50mph is not too hard to get.