1998-2005 KTM 400 660 LC4 Enduro Service Repair Workshop Manual

This is the COMPLETE Service and Repair Manual for the 1998-2005 KTM 400 660 LC4 Enduro Service Repair Workshop Manual. It covers every single detail.

1998-2005 KTM 400 660 LC4 Enduro Service Repair Workshop Manual PDF VEHICLE/EQUIPMENT INTRODUCTION: The KTM LC4 engine platform is one of the most celebrated single-cylinder engines in the history of dual-sport and enduro motorcycles. Developed originally by Rotax and continuously refined by KTM, the LC4 (Large Capacity 4-stroke) was offered in both 400cc and 660cc displacements, providing riders with either a license-friendly mid-range performer or a thundering large single-cylinder thumper with impressive torque and power. These machines dominated the enduro and adventure riding scenes throughout the late 1990s and early 2000s. The KTM 400 LC4 models were versatile machines suitable for both on-road commuting and serious off-road trail riding, while the 660 LC4 variants, including the legendary 640 and 660 SMC, LC4 Enduro, and Adventure models, pushed the concept of the big single to its limits with nearly 60 horsepower in some configurations. The LC4's overhead camshaft design with four valves per cylinder, electric start, and dry sump lubrication made it both technologically advanced and mechanically accessible for owner maintenance. This comprehensive service repair manual covers the KTM 400 and 660 LC4 models from 1998 through 2005, providing all the specifications, procedures, and diagnostic information needed to maintain and repair these capable enduro and adventure machines to factory standards. SERVICE & REPAIR SCOPE: - LC4 engine complete overhaul with cylinder head valve clearance adjustment, cam chain tensioner service, and head gasket replacement - Big-end bearing inspection and replacement with crankshaft truing specifications - Piston and ring replacement with cylinder bore measurement and honing procedures - Clutch basket inspection for notching, plate thickness measurement, and spring specifications - Five-speed transmission disassembly with shift drum bearing and fork inspection - Carburetor Keihin or Dell'Orto service with jetting specifications for altitude compensation - Decompression mechanism inspection and cable adjustment - Starter motor service including Bendix drive and solenoid testing - Ignition system CDI diagnostics and ignition coil testing - Radiator flush, thermostat replacement, and coolant temperature sensor testing - Oil pump inspection with pressure relief valve testing and oil filter maintenance - Exhaust system header pipe inspection and muffler repacking procedures - Front fork WP cartridge service with oil specification and seal replacement - Rear WP shock absorber rebuild with PDS linkage bearing replacement - Steering head bearing adjustment and race replacement - Wheel hub bearing replacement with spoke tension specifications - Front and rear brake disc wear limits and pad replacement - Brake caliper piston seal rebuild and master cylinder overhaul - Chain, sprocket wear measurement and final drive gear ratio options - Frame and subframe weld inspection with alignment check - Electrical system wiring

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