I have been looking at a 82 gl 1100 and thinking about buying it. Bike looks good starts right up and idles fine but on my first test ride i heard what could be described as a slight knock. I ask the owner about this and he said the Honda shop told him it was a "rumble from a valve common in the years 82-84". Anybody know if this is true or not? I like the bike but I'm not looking at dumping alot of money into it.