Don't lend it to your mate again, Sounds like he wants to rev it to death.

No way you should be routinely hitting the rev limiter on a big single or any other bike, no point on your bike as you are way past the power whan you do this and its cruel! Rev limiters are certainly not there to advise that it's time for a gear change. Rather that its time to alter your riding style.

for big revs I suggest a 4 cylinder sportsbike.

Al.