We were riding yesterday in 60 degree weather and my brother-in-law's 2003 xr650 started overflowing. He has had this problem at least once before. Unfortunately he dropped the motorcycle a few weeks ago and the radiator was damaged. The dent is on the lower left side and is noticable but very small. Probably about 1/2" mashed in and maybe 1" to 2" in length. Do you think this could be the problem? We were near the end of a 20 mile ride and had been in a good bit of sand on and off for a good bit of the ride. Any help would be appreciated. Thanks.