ok so a buddy of mine bought a 99 CBR 600 F something and brought it to me to check out from what I can tell the clutch is no fully engaging the bike runs good but barely moves he told me the guy the he bought it off of said it ran good before he changed the clutch cable then it started doing that. he had the clutch adjusted the lever was all the way back and I even took the cable off the lever and got him to speed shift it and it still does it clutches are not fully engaging from what I can tell they disengage but will not engage fully. so any advice as to what the problem may be or what he would need to purchase would be appreciated. idk if there's some kind of adjustment on it or if the clutches are fried.