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 KTM - 600 GS LC4
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KTM GS LC4 motocyclette motorrad motorcycle vintage classic classique scooter roller moto scooter
Photo ou archives : F-M. Dumas

Capacity : 600
Model : GS LC4
Production : 1990 -
Category : (On-Off) Dual Purpose


GS 600 LC4 - 1991

A high-tech four-stroke

Outclassed in off-road competition by the lighter and more powerful two-stroke, the four-stroke engine began to reassert itself in certain specialized disciplines in the mid- 1980s, thanks to sophisticated technology.

Response to the Husky

Launched in 1986, the Husqvarna 510 revolutionized the world of motocross and enduro racing. This compact, light and extremely powerful four-stroke used the bottom end of a two-stroke engine and revved freely. The Husky's bitter rival, the Austrian two-stroke specialist KTM, responded in 1988 with its own in-house four-stroke, the 600 LC4.

Teething Problems

KTM started work on this engine as a replacement for the outdated and overweight Rotax two-stroke. Engineer Josef Hattinger responded to the very precise design parameters – compactness, lightness, performance and individuality. It had a handsome oversquare four-valve four-stroke single with a single-overhead-camshaft, liquid cooling, lightweight (4.4 lb) bottom-end assembly, short connecting rod, minimal inertia, and freedom from high-frequency vibrations. It had a lot of high technology for an engine that weighed under 80 lb. It developed a genuine 47 hp at 7500 rpm. The debut of this splendid engine was marred by tricky starting and a tendency to seize. The works soon rectified these teething troubles. Fitted in a frame incorporating all KTM's know-how, the 600 LC4 delighted fans of sporting four-strokes in the early 1990s.


Engine: 553cc (95x78mm) water-cooled single-cylinder four-stroke

Power Rating: 47 hp @ 7500 rpm

Valves: overhead-camshaft; 4 valves

Fuel System: carburetor

Transmission: 5-speed, chain final drive

Suspension: reversed telescopic forks (front); swing arm with single damper (rear); displacement 11.8 inch (front); 13 inch (rear)

Brakes: disc (from & rear}

Wheels: 21 inch (front}; 18 inch (rear)

Weight: 256 lb

Light, compact and powerful, today's competition four-strokes have little in common with previous generations of off-roaders.

Le fichier Moto Passion réalisé par François-Marie Dumas réunit près de deux mille photos accompagnées d'un historique très complet des machines présentées.
Il sera progressivement mis à jour ici et toute information complémentaire est la bienvenue sur info@moto-collection.org.

Cette documentation unique, qui constitue sans doute l'encyclopédie la plus exhaustive jamais écrite sur l'histoire de la moto, a été réalisée avec l'assistance de nombreux spécialistes dont principalement Didier Ganneau, Christophe Gaime, Mick Woollett, Jean Goyard, Bernard Salvat, Christian Rey, Yves Campion, Helmut Krackowizer, Michael Dregni, Michel Montange, etc. que je remercie ici.

Disponible sur demande :
- Les fiches originales sur papier
- Les photos et archives signées de mon nom en haute définition ou les documents originaux.
Me contacter sur info@moto-collection.org pour les conditions et droits d'utilisation.