Hi i have a 1960-1979 KZ650B1, heavily modified but motor pretty much stock, this happend one day when I was kick starting the bike in the cold randomly one kick became very light and it would not engage any more took it to a garage they didn't know but changed the clock of the gears so it could be kick started again as the starter motor just spins I think its the starter clutch but I have no idea whats going on with this, sounds like a ratchet spinning backwards as I can't get a video of it uploading correctly , also does not like to roll back even with the clutch in. Any help would be great thanks.