I am at 56k miles with my 05.5 I replaced the motor at 52k due to over torquing one of the bolts on the clutch pack. It broke free about 600 miles after I installed the new clutch plates. The fault was mine. The only issues I ever had prior was a valve adjustment finally being necessary at 46k and even then I believe only two were barely out of spec . The new motor( it's an 06) runs great and has 39k on it. I have no doubt this machine will keep going for years more. The goal now is to install a sidecar ( so my four year old can ride with me) on the 05 and find either an SE or a 990Adv as a solo bike. If I could only have one bike this would be it.
Topes never seem to make me go any faster.