Target Audience:
Riders wanting a lightweight, hard-accelerating single-cylinder street bike with minimal maintenance burden
Competitive Advantage:
Low weight, strong torque from a 640cc LC4 single, and straightforward air/oil-cooled engineering easy to service at home
Engine:
640cc LC4 single-cylinder four-stroke
Frame:
Tubular chromoly steel trellis frame
Character:
Supermoto-derived handling with street-focused gearing and suspension
Coverage Areas:
Complete service, repair, rebuild and refurbish procedures for all systems
Manual Type:
Workshop Repair Service Manual
Delivery Method:
Instant download on completion of payment
Printable:
All pages printable for workshop use
Engine:
LC4 640cc single: removal, disassembly, inspection, rebuild
Fuel System:
Carburetor or electronic fuel injection components, throttle, fuel delivery
Ignition System:
Digital ignition, spark plug, stator and CDI diagnostics
Cooling:
Oil cooler circuit and engine cooling components
Clutch:
Wet multi-plate clutch inspection, replacement and adjustment
Transmission:
Gearbox disassembly, gear inspection, shift mechanism
Final Drive:
Chain and sprocket service, drive specifications
Wheels and Brakes:
Wheel, disc brake, caliper and master cylinder procedures
Suspension:
Front forks and rear shock service and setup
Steering:
Headstock bearings, handlebar and steering components
Electrical System:
Wiring schematics, charging system, lighting, switches
Frame and Bodywork:
Trellis frame, subframe, fairing and body panels
Diagnostics:
Troubleshooting charts and fault-finding procedures
Step-by-Step Instructions:
Detailed illustrated procedures for every repair and adjustment
Torque Specifications:
Full tightening torque tables for all fasteners
Wiring Diagrams:
Complete wiring schematics for the 1998-2005 range
Periodic Maintenance:
Service schedules, valve clearance checks, fluid changes
Level:
Workshop-level detail suitable for professional technicians and DIY owners
Illustrations:
Detailed illustrations, exploded diagrams and photographs throughout
Parts Information:
Part numbers, exploded part diagrams and specifications where applicable
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Engine Type:
KTM LC4 single-cylinder four-stroke
Cooling:
Water-cooled with oil cooler
Fuel System:
Carburetor; later models fitted with electronic fuel injection
Approximate Power:
Approximately 50 hp depending on model year and market
Lubrication:
Pressurized wet sump with oil cooler
Engine Oil:
Motorex or equivalent 15W/50 or 10W/50 motorcycle oil per manual specification
Oil Change Interval:
Per factory service schedule covered in the manual
Valve Clearances:
Check at scheduled intervals; complete procedure included
Chain:
Regular chain tension and lubrication service
Common Wear Items:
Brake pads, chain and sprockets, clutch plates, spark plug, wheel bearings
Known Issues:
LC4 single known for routine valve adjustment needs and checking oil levels due to wet sump design
