DRZ400, was always on a search for more power (due to riding on road), managed a GPS 110mph on it with keihin FCR, single base gasket and airbox mod
KTM640, awesome bike when it worked, the shame was the fact I bought it from a dealer who assured me the knocking noise was the tappets, after riding a few hundred miles i found the tappets to be fine, eventually it turned out to be the oil pumps...