Join Date: Jun 2009
Location: SouthWest Missouri 2002 ZX-6R
No experience with the 650 myself, but I do know when I switched to Rotella 15w-40 in my Ninja the shifting seemed alot smoother, though it was never what I would describe as "clunky" on my bike.
It's worth a shot to try a little heavier oil, as long as your bike can use it.
"We guard our money with well armed men and our children
with "gun free zone" signs. That's the priorities of the
damned. " - WillBrink