The last of the 2V engines were very, very civilized and quiet. To me they had actually lost a bit of the mechanical 'Rawness' that attracted me to Guzzis all those years ago. That all changed with the advent if the early A5 motored 4V. How they ever got them through noise testing I have no idea! Some are worse than others, (Mine is the noisiest one I've heard!) heat makes it louder. On a 40*C day mine makes a noise like a major shunting operation in a crowded goods yard! The cams are not shimmed for end float so they rattle around, then there is the 'Cyclic Rattle' of the spinning tappets, the whirring of the chains, assorted bearing and gear noises, a huge cacophony of noises none of which sound good!
The thing is it refuses to go wrong!
The later flat tappet engines are appreciably quieter due to the absence of cam end float but can still be loud enough. The roller tappet motors are still noisier than the last of the 2V's but as long as the valves are spot on they are considerably less noisy than the flat tappet bikes but still retain that raw, 'Mechanical' something the last of the pushrod bikes were missing.