Factory OEM engine workshop service manual for the KTM LC4 single-cylinder four-stroke platform, covering the 400/540 SXC, 400/620 SX/SC, 620 LC4 Competition, 400/640 LC4, 640 Adventure-R, 640 Duke, and 660 SMC across model years 1998 through 2003.
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This is the KTM factory repair manual (base Art. No. 3.205.49-E, updated through Art. No. 3.206.006-E, Edition 4/2003), covering the entire LC4 single-cylinder four-stroke engine platform across model years 1998 through 2003. It spans the 400/540 SXC, 400/620 SX and SC, 620 LC4 Competition, 400/640 LC4, 640 Adventure-R, 640 Duke-E/Duke, SC/Supermoto, LC4-E/Adventure/Duke, and the 660 SMC introduced for 2003.
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| Engine (640 LC4, 2003) | 625 ccm, liquid-cooled single-cylinder 4-stroke with balancer shaft |
|---|---|
| Engine (660 SMC, 2003) | 653 ccm, liquid-cooled single-cylinder 4-stroke with balancer shaft |
| Bore/Stroke | 640 LC4: 101/78 mm / 660 SMC: 102/80 mm |
| Transmission | 5-speed, claw shifted |
| Clutch | Multi-disc clutch in oil bath |
| Ignition | Contactless DC-CDI, KOKUSAN (4K5 on 640 LC4 2003) |
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