This service manual provides service, repair and maintenance for the engines in 1998 KTM 400LC4, 400SXC, 400SX, 400SC, 540SXC, 620SX, 620SC, 620LC4, 640LC4, 640 Adventure-R and 640 Duke-E motorcycle models. Please note that this manual covers the motorcycle engine only.

Table of Contents

SERVICE-INFORMATION, GENERAL INFORMATION, REMOVING AND REFITTING THE ENGINE, DISASSEMBLING THE ENGINE, SERVICING OF INDIVIDUAL COMPONENTS, ASSEMBLING THE ENGINE, ELECTRICAL, FUEL SYSTEM, TROUBLE SHOOTING, TECHNICAL SPECIFICATIONS, PERIODIC MAINTENANCE SCHEDULE, WIRING DIAGRAMS.

Please note that this book is also the base manual for 1999 models, you will need to purchase this manual in addition to the supplement which is 320573-E.

For the 2000-2001 you will need to purchase this manual in addition to the supplement which is item 320589-E.

For the 2002 model you will need to purchase supplement #321030-E.