Time for new springs.Haven't blown an engine yet.......the valves start floating at about 6,200rpm.
The oil looked better than I expected being fairly dark with some fine metallic, but still good transparency. I'm running Maxima 100% petroleum base for break-in. The next oil change will be the 50/50 pet/syn oil.
Do you have a catch can on the green bike? That's what it looks like.
Either way, nice rigs.