I used to ride my dad´s in high school and it did the same thing, sputtering out at about 55. Just got it from my dad´s this weekend (11 years later) and am trying to restore it because it hasn´t been ran since. If you´ve found anything, let me know. E-mail if you like, I have a few questions I am searching and this is how I came across this forum, the only one I´ve found...