KTM 1998 2003 - 400 540 620 640 SXC SC LC4 LC4-E Supermoto- Engine - Service Workshop Repair Manual
KTM 1998–2003 LC4 Engine Workshop Service & Repair Manual (400 to 640cc) – Instant PDF Download
Rebuilding the legendary big-bore KTM single? Do it right with factory-engineered specifications.
Get immediate access to the definitive technical workshop manual dedicated specifically to the 1998–2003 KTM LC4 Liquid-Cooled 4-Stroke Engine Family. Built for dual-sport riders, supermoto racers, and garage mechanics, this digital manual provides the exact factory tolerances, crankcase splitting procedures, cam-timing sequences, and fastener torque specifications needed to rebuild your LC4 powerplant from the crank up.
Whether you are replacing worn cam follower roller bearings, shimming crankshaft axial play, overhauling the electric start sprag clutch, or bleeding the frame-backbone oil circuit, this manual delivers full step-by-step guidance.
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Engines & Displacements Covered (1998 to 2003):
400 LC4 (400 SXC / SC / LC4 / LC4-E)
540 LC4 (540 SXC / Super Competition)
620 LC4 (620 SC / Super Competition)
640 LC4 (640 LC4 / LC4-E / Supermoto / Adventure / Duke II – 625cc)
(Covers both kick-start-only and electric-start [E-Start] crankcase configurations)
What’s Included in This Dedicated Engine Manual?
This technical publication focuses 100% on the mechanical overhaul, precision measurement, inspection, and assembly of the LC4 powerplant:
Cylinder Head & Valvetrain Overhaul: Rocker arm roller inspection (intake/exhaust cam follower bearings), valve seat cutting angles, screw-and-locknut valve lash adjustments (0.15mm cold), automatic/manual decompression linkage timing, and camshaft bearing installation.
Cylinder, Piston & Rings: Nikasil cylinder bore wear limits, piston-to-cylinder clearance tables, piston ring end-gap measurement, and wrist-pin fitment.
Crankcase Splitting & Crankshaft Overhaul: Crankcase separation workflows, main cylinder roller bearing replacement, crankshaft truing/runout tolerances, connecting rod big-end bearing
