Re: motorbicycling.com land speed record
It seems to me if you're going for a record then go for the record with whatever is allowed in a cc class. You'd need to find that out first. Say it was 50cc, what's the point of racing an unmodified HT motor? Use what you want, innovate, modify to see what you can get out of 50 CCs. Any make and any modifications including something like foureasy's hybrid motors, Morini... whatever will give the greatest speed.
Someday when I grow up I will probably lose interest in toys with wheels, but until then...