I have set up a 96 CR for enduros and my buddy set up his 01 YZ250. With that said I would recommend buying a bike already set up for enduros instead of changing a MXer You mentioned you cannot afford buying a new bike. Total up a tank, headlight, coil, flywheel, oring, sprockets, tires, steering dampner, bark busters, and suspension mods. Then compare that to a KTM or YZFE and you will find that for a limited budget a bike made for enduros is a good option. A used 96 or97 KTM 200EXC or 300EXC is ready to go. So is a 426 YZFE.