acceleration

Symptoms: bike stalls at low speeds takes forever to start after stalling once accelerating, bike thrashes wildly, jumping between 0-6000 rpms, jerking like crazy (scary) even at steady throttle, bike will start thrashing Background: This is a 1977 XS400 with about 12,000 miles on it. I've...

Hey guys, I realized today that I have had my xs for over 2 years and hadnt yet done a no holds barred 0-60 run. So I flogged it a little and the little thing surprised me :D anyone know haw quick a 1980 xs400 is supposed to do it in? it honestly felt pretty quick, around 6 or 7 seconds even...