What's the torque on those?
I think I have the same issue. Hard to tell, though - in that I kept the revs below 7200 while the engine was green. Now with 1100 miles on it, I'm winding it up - and I'm feeling buzzes I never felt before.
I was impressed, when it was new, how smooth it was for a single.
Anyway...what's a good torque value?