KTM 50 AC/LC Repair Manual Set, 2002–2008 (P/N 3.206.047-E)

The KTM repair manual pairs engine overhaul procedures with model-year specifications and service schedules. The owner’s manuals cover routine care and model-specific adjustments, while the two WP publications cover bench service for their respective rear shocks.

The main repair manual focuses on the engine. Chassis coverage consists of specifications, scheduled checks, maintenance and adjustment procedures, and dedicated rear-shock service.

Search, Bookmarks, and Page Count

Finding service information: The main text is searchable across all seven publications. Bookmarks reach the four owner’s manuals and both WP manuals, with detailed chapter links for the KTM repair manual and the WP 3614 BAEM manual. Some bookmarks point to an index or to an external file. Zoom in to read the small wire labels on the ignition diagram.

The download contains one printable, English-language PDF with 350 pages. The total includes the cover and back-cover pages, one binder-spine page, 31 blank pages, and eight pages with only page numbering or a language label.

Engine Overhaul, Ignition Tests, and Rear-Shock Service

This selection of workshop topics is part of the set. The KTM repair manual also covers reed-valve housing and intake-flange inspection, as well as brake-fluid replacement for the applicable configurations.

• Engine overhaul: Engine removal and refitting, crankcase separation, crankshaft and output-shaft service, piston and cylinder inspection, and reassembly with the Dimension X check.

• Centrifugal clutch and primary drive: Disassembly, shoe and drum inspection, AC and LC spring arrangements, axial-clearance setup, reassembly, and troubleshooting.

• Carburetion and lubrication: Carburetor operating ranges, model-year jetting tables, and separate oil-pump bleeding procedures for the two production layouts.

• Cooling and ignition: LC water-pump overhaul and cooling-system bleeding, plus stator resistance and peak-voltage tests, fault charts, and an ignition wiring diagram.

• Chassis and routine service: Model-specific steering-head, fork, suspension sag, chain, wheel, brake, cooling, air-filter, control, gear-oil, and clutch checks and adjustments.

• WP rear shocks: Exploded views, removal and installation for the 3614 BAEM, and bench procedures for teardown, joint and bushing service, oil filling, nitrogen charging, and spring setup.

KTM’s repair procedures assume professionally trained mechanics. The owner’s manuals distinguish routine owner care from work marked for a specialized KTM dealer.

Model-Year Reference Tables

The June 2008 edition incorporates the 2002 base issue and annual updates through 2008. The update record identifies the 2003–2008 editions by the first digit of the engine number, from 3 through 8, respectively.

The 2002–2003 tables list the 50 Mini Adventure, 50 Junior Adventure, 50 Senior Adventure, 50 SX Pro Junior LC, and 50 SX Pro Senior LC. The 2004–2005 tables list the Mini and Senior Adventure and both SX Pro LC variants. For 2006, the tables list the Mini and Senior Adventure, 50 SX Junior, 50 SX, and 50 Supermoto. The 2007 tables list the Mini and Senior Adventure, 50 SX Junior, and 50 SX. The 2008 tables list the 50 Mini Adventure, 50 Mini SX, 50 SX Junior, and 50 SX.

The tables distinguish premix from separate lubrication and identify the Dell’Orto carburetors by application. Use the matching table to select jetting and service data for the engine and model year on the bench. Reference data also covers tightening torques, wear limits, fitting clearances, fluids, fork and shock settings, and service intervals.

Engine Assembly and Ignition Diagnosis

The Dimension X procedure uses cylinder-base gasket thickness to set piston height relative to the top of the cylinder. KTM also flags two assembly risks: the sharp output-shaft edge can cut its seal, and hammering the shafts into place can damage the bearings and crankshaft.

The ignition diagram traces the stop button, generator, and ignition coil. The peak-voltage chart distinguishes AC and LC readings and specifies whether the ignition coil is connected during the test. The factory-tool list identifies flywheel puller 590.29.021.000, rotor holder 451.12.021.000, Dimension X plate 451.29.006.000, and brake bleeding syringe 503.29.050.000.

WP Shock Identification and Service

The 3612 BAEM workshop manual details piston-rod and tube-side service, including the adapter DU bushing and KGW heim joint. The 3614 BAEM manual adds separate parts and settings sheets for the 2007 50 SX Junior (03.18.9C.01) and 50 SX (03.18.9C.02), along with rebound damping and spring-preload adjustments.

The 3614 BAEM manual shows the correct distance-bushing placement and shock orientation for the 50 SX Junior to keep the spring clear of the swingarm. The tool list identifies the T101S spring tool, T313 oil-seal sleeve, T1207S mounting tool, and T170S1 nitrogen filling device. Shock teardown and nitrogen charging involve stored pressure and call for trained handling and the specified WP equipment.

Sample Piston and Ignition Checks

The KTM 50 AC/LC repair manual gives a maximum piston-ring end gap of 0.20 mm when measured about 10 mm below the top of the cylinder. The ring check is part of the piston and cylinder inspection before reassembly.

At 20 °C, the ignition checks specify 500 Ω ± 40 Ω for the disconnected stator and 2250 Ω ± 250 Ω for the ignition-coil secondary, measured between the high-tension lead and coil ground.