KTM 400-660 LC4 1998-2005 Repair Manual page 359

IMPORTANT RECOMMENDED MAINTENANCE PROCEDURES TO BE PERFORMED BASED ON A SEPARATE SUPPLEMENTARY ORDER
Perform complete fork maintenance
Perform complete suspension strut maintenance
Perform complete reversing lever maintenance
Clean and lubricate steering-head bearing and sealing elements
Clean and adjust the carburetor
Treat the electrical contacts and switches with contact spray
Treat battery connections with contact grease
Change the brake fluid
VITAL CHECKS AND CARE PROCEDURES TO BE CONDUCTED BY THE OWNER OR THE MECHANIC
Check oil level
Check brake fluid level
Check brake pads for wear
Check lighting system for proper operation
Check horn for proper operation
Lubricate and adjust actuating cables and nipples
Bleed fork legs in regular intervals
Remove and clean fork dust sleeves in regular intervals
Clean and lubricate chain as necessary
Check chain tension
Clean air filter and filter box (depending on the dirt accumulation)
Check tire pressure and wear
Check coolant level
Check fuel lines for leaks
Drain float chamber
Check all control elements for smooth running
Check brake performance
Treat exposed metal components (except for the braking and exhaust
systems) with wax-based anti-corrosion agents
Treat ignition/steering lock and light switch with contact spray
Check all screws, nuts, and hose clamps for their tight fit
before after every
each start cleaning
12-43F
at least every 2 years
once a year or 20000 km
for cross once
country use a year