a friend of mine just bought an 1988 XR600 and he has been complaining about the handling. i tested his bike out and i could say there is something wrong with it. it steers a like an overweight custom made chopper! does this have something to do with the 17" rear tire? will converting the rear wheel to 18 solve this problem? btw, his XR is in good condition and it was used more on the streets by the previous owner.