KTM 450 XC Owner's Manual page 66

SERVICE SCHEDULE
Check wear of valve guides.
Check valves.
Check valve springs.
Check the radial clearance of the rocker arm rollers.
Measure length of timing chain.
Check the timing-chain tensioner function.
Check crankshaft and crankshaft journal for run-out.
Change conrod bearing.
Change the crankshaft main bearing.
Change the balancer bearing.
Check wear of all transmission components including shafts
and bearings.
Check long bypass valve spring.
Change glass fiber yarn filling of main silencer.
Replace foot brake cylinder seals.
Check carburetor components.
S15A: Every 15 service hours - corresponds to about 105 liters of fuel / after every race
S30A: Every 30 service hours - corresponds to about 210 liters of fuel
S45A: Every 45 service hours - corresponds to about 315 liters of fuel
S60A: Every 60 service hours - corresponds to about 420 liters of fuel
S90A: Every 90 service hours - corresponds to about 630 liters of fuel
J1A: annually
J2A: every 2 years
Competition use
S15A S30A S45A S30A
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Hobby use J1A
S60A S90A
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J2A