Clymer Repair Manual for Honda XR80/CRF80 and XR100/CRF100. Clymer manuals are written specifically for the do-it-yourselfer. Manufacturer manuals are purposely designed for the professional technician. These provide easy-to-follow instructions that allow the novice or less than proficient user to safely and efficiently service and repair his machine. Extremely useful to have when attempting to rebuild your engine.