hi everyone...im thinking of purchasing a 90 model electra glide...i had a mate test ride it for me as it is located 7 hours from me...he said it went well ...excellerated great,felt nice and tight ,but he said it shaked(vibrated) only when he backed off the throttle , he also told me it did it when it was coasting downhill,,he pulled in the clutch and it stopped shaking...any ideas or input would be great.....cheers.