My friend just bought an '04 xr650r. This was the first time I have ridden a 650r and I thought it did not have enough bottom end:thumbsdn: . My '87 xr600r had more torque before I tore it down to rebuild (burning oil, loss of compression). Also, after a short ride, it overheated and began stalling. My friend told me the fluid levels were good and that the only other owner had done no mods. Will the popular "uncorking" resolve these issues or are there other issues?