Target Audience:
Technicians, mechanics, and DIY owners servicing 1998 KTM 400/620 RXC engines
Intended Use:
Parts identification and ordering for engine replacement and rebuild work
Primary Advantage:
Factory exploded-view diagrams with OEM part numbers for exact-fit replacement
Diagram Style:
Exploded-view parts diagrams with callout reference numbers
Part Numbers:
Genuine KTM part numbers listed per component
Lookup Method:
Indexed by engine assembly section for fast part identification
Manual Type:
Factory replacement parts catalog
Coverage Area:
Engine replacement parts for 400 and 620 RXC models
Format:
Searchable PDF (zoomable, printable, bookmarked)
Delivery Method:
Instant digital download
Page Count:
N/A - not specified for this catalog
Device Compatibility:
Windows PC, Mac, tablets, and smartphones
Re-Download:
Download again anytime after purchase
Cylinder Head:
Valves, valve springs, camshaft, rocker arms, head fasteners
Cylinder and Piston:
Cylinder, piston, rings, pin, circlips
Crankshaft:
Crankshaft assembly, connecting rod, bearings
Ignition System:
Stator, rotor, ignition coil, spark plug components
Clutch:
Clutch plates, springs, basket, hub, actuation parts
Gearbox:
Transmission gears, shafts, shift drum, shift forks
Kickstarter and Electric Starter:
Starter components and kick mechanism parts
Carburetor:
Carburetor jets, float, needle, and related components
Lubrication:
Oil pump, oil lines, filters, and seals
Cooling System:
Radiator, hoses, water pump components
Engine Cases:
Crankcase halves, covers, gaskets, and seals
Fasteners:
Engine mounting bolts and special hardware
Exploded Views:
Every engine assembly shown as an exploded diagram
Part Numbers:
OEM KTM part numbers for each referenced component
Component Identification:
Reference numbers linking diagrams to parts lists
Tool References:
Special service tool numbers where applicable
Torque Specifications:
Factory torque values for engine fasteners
Diagnostic Support:
Troubleshooting flowcharts and symptom-based diagnostics
Wiring Diagrams:
Electrical schematics for ignition and starter circuits
Wear Limits:
Tolerances and allowable wear limits for rebuild inspection
Engine Variants:
400 RXC and 620 RXC four-stroke single-cylinder engines
Year Coverage:
1998 model year
Trim Levels:
All models and engine variants covered
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
Primary Engine:
KTM LC4 single-cylinder four-stroke
Displacement Range:
400 cc and 620 cc variants
Valvetrain:
Single overhead cam, four-stroke
Fuel Delivery:
Carburetor
Detailed Specs:
Refer to manual for complete factory specifications
Power Output:
N/A - not specified in parts catalog; see service manual
Standard Transmission:
Manual, multi-speed gearbox with chain final drive
Clutch:
Wet multi-plate clutch
Shifting:
Sequential foot-shift mechanism
Gear Count:
N/A - refer to service manual for exact specification
Parts Covered:
Gears, shafts, shift drum, shift forks, clutch components
Diagram Type:
Exploded views with OEM part numbers
Maintenance Schedules:
General maintenance schedules included in service scope
Wear Items:
Piston, rings, clutch plates, and valve components covered for replacement
Fluid Specifications:
Lubrication system parts and oil specifications covered
Known Issues:
Wear limit inspections and allowable tolerances provided for high-wear engine parts
