mine let loose at 4600km, my dads squeaked at just shy of 4000km, still runs just that middle bearign tightening up after a long pull. mine did the same couple hours before it let loose. actually mine tightend up early in the day and i probably put on annother 40-50km of hard riding before it finaly let loose 2km from the truck.
when they start tightening up, flip the choke on, little more lube it'll go a little further lol.
on the 07's i think its not if more of a when. worth buying the extened warrenty