Seems like I hit with some trouble on the bike.
Though I usually never take the bike in 5th gear above 65MPH, last week I did about 60 miles at Wot (80MPH) in 5th.
I wanted to test how much my MPG was, doing 6k RPM over doing 7 or 8k.
My clutch started slipping on the way back.
On my way to, I didn't go all out; I had wind in the back, and going to 80 was a breeze.
On my way back I had about a 10-15MPH headwind, and after 10 miles on my way back (30 miles to, 30miles back), I experienced a controlled clutch slip; where the engine slowly started increasing RPM, while my speed stayed at 80MPH.
I immediately rolled off the throttle, and continued my journey in 4th gear, doing 70MPH.
Greatly saddened though...
I really wanted to record top speed MPGs.
Now the bike will never exceed 65MPH in 5th.
I'm not confident enough to replace the clutch. The new clutch might have the same problems.
I probably would be more comfy replacing clutch springs, if that would help, but I doubt I'd find good springs for that!