KTM 125 SX 2021 Maintenance Schedule
The 2021 KTM 125 SX maintenance schedule below covers the manufacturer's recommended service intervals for oil, general maintenance, brake fluid, tires, drive chain maintenance, spark plugs, coolant and air filter. Intervals are shown in kilometres by default and can be switched to miles.
125ccEngine size
48Maintenance items
Official manufacturer manual
Sourced from KTM Owner's Manual (official PDF content, mirrored via authorized KTM dealer ktmshop.se): ktmshop.se
Full schedule
| Task | Interval | Difficulty | Notes |
|---|---|---|---|
| Change the gear oil | Every 10 operating hours | Easy | Change the gear oil |
| Check the front brake linings | Every 10 operating hours | Easy | Check the front brake linings |
| Check the brake linings of the rear brake | Every 10 operating hours | Easy | Check the brake linings of the rear brake |
| Check the brake discs | Every 10 operating hours | Easy | Check the brake discs |
| Check the brake lines for damage and leakage | Every 10 operating hours | Easy | Check the brake lines for damage and leakage |
| Check the rear brake fluid level | Every 10 operating hours | Moderate | Check the rear brake fluid level |
| Check the free travel of the foot brake lever | Every 10 operating hours | Easy | Check the free travel of the foot brake lever |
| Check the frame | Every 10 operating hours | Easy | Check the frame |
| Check the link fork | Every 10 operating hours | Easy | Check the link fork |
| Checking the fork bearing for play | Every 20 operating hours | Moderate | Checking the fork bearing for play |
| Checking the shock absorber heim joint for play | Every 10 operating hours | Advanced | Checking the shock absorber heim joint for play |
| Check the shock absorber linkage | Every 10 operating hours | Advanced | Check the shock absorber linkage |
| Check the tire condition | Every 10 operating hours | Easy | Check the tire condition |
| Check tire pressure | Every 10 operating hours | Easy | Check tire pressure |
| Check the wheel bearing for play | Every 10 operating hours | Advanced | Check the wheel bearing for play |
| Check the wheel hubs | Every 10 operating hours | Easy | Check the wheel hubs |
| Check the rim run-out | Every 10 operating hours | Easy | Check the rim run-out |
| Check the spoke tension | Every 10 operating hours | Easy | Check the spoke tension |
| Check the chain, rear sprocket, engine sprocket, and chain guide | Every 10 operating hours | Easy | Check the chain, rear sprocket, engine sprocket, and chain guide |
| Check the chain tension | Every 10 operating hours | Easy | Check the chain tension |
| Grease all moving parts (e.g., hand lever, chain, ...) and check for smooth operation | Every 10 operating hours | Easy | Grease all moving parts (e.g., hand lever, chain, ...) and check for smooth operation |
| Check/correct the fluid level of the hydraulic clutch | Every 10 operating hours | Easy | Check/correct the fluid level of the hydraulic clutch |
| Check the front brake fluid level | Every 10 operating hours | Moderate | Check the front brake fluid level |
| Check the free travel of the hand brake lever | Every 10 operating hours | Easy | Check the free travel of the hand brake lever |
| Check steering head bearing play | Every 10 operating hours | Advanced | Check steering head bearing play |
| Change the spark plug and spark plug connector | Every 10 operating hours | Easy | Change the spark plug and spark plug connector |
| Check the antifreeze and coolant level | Every 10 operating hours | Easy | Check the antifreeze and coolant level |
| Check the cables for damage and for routing without kinks | Every 10 operating hours | Easy | Check the cables for damage and for routing without kinks |
| Check that the throttle cables are undamaged, routed without sharp bends, and set correctly | Every 10 operating hours | Easy | Check that the throttle cables are undamaged, routed without sharp bends, and set correctly |
| Clean the air filter and air filter box | Every 10 operating hours | Easy | Clean the air filter and air filter box |
| Change the glass fiber yarn filling in the main silencer | Every 20 operating hours | Easy | Change the glass fiber yarn filling in the main silencer |
| Service the fork | Every 40 operating hours | Advanced | Service the fork |
| Perform the shock absorber service | Every 40 operating hours | Advanced | Perform the shock absorber service |
| Check the tightness of the easily accessible, safety-relevant screws and nuts | Every 10 operating hours | Easy | Check the tightness of the easily accessible, safety-relevant screws and nuts |
| Change the front brake fluid | Every 10 operating hours | Moderate | Change the front brake fluid |
| Change the rear brake fluid | Every 10 operating hours | Moderate | Change the rear brake fluid |
| Change the hydraulic clutch fluid | Every 10 operating hours | Moderate | Change the hydraulic clutch fluid |
| Lubricate the steering head bearing | Every 10 operating hours | Easy | Lubricate the steering head bearing |
| Check/adjust the carburetor components | Every 10 operating hours | Moderate | Check/adjust the carburetor components |
| Change the needle jet | Every 10 operating hours | Moderate | Change the needle jet |
| Change the coolant | Every 20 operating hours | Moderate | Change the coolant |
| Perform minor engine service (check the inlet membrane; check the clutch; under difficult operating conditions, change the piston and check the cylinder and Z dimension) | Every 12 months · Every 40 operating hours | Advanced | Perform minor engine service (check the inlet membrane; check the clutch; under difficult operating conditions, change the piston and check the cylinder and Z dimension) |
| Perform the intermediate engine service (change the piston and check the cylinder and Z dimension; check the exhaust power-valve control for functioning and smooth operation) | Every 48 months · Every 40 operating hours | Advanced | Perform the intermediate engine service (change the piston and check the cylinder and Z dimension; check the exhaust power-valve control for functioning and smooth operation) |
| Perform major engine service including removing and installing the engine (change the connecting rod, conrod bearing, and crank pin; check the transmission and shift mechanism; change all engine bearings) | Every 40 operating hours | Expert | Perform major engine service including removing and installing the engine (change the connecting rod, conrod bearing, and crank pin; check the transmission and shift mechanism; change all engine bearings) |
| Check all hoses (e.g. fuel, cooling, bleeder, drainage, etc.) and sleeves for cracking, leaks, and incorrect routing | Every 10 operating hours | Easy | Check all hoses (e.g. fuel, cooling, bleeder, drainage, etc.) and sleeves for cracking, leaks, and incorrect routing |
| Check the idle speed | Every 10 operating hours | Easy | Check the idle speed |
| Final check: check the vehicle for operating safety and take a test ride | Every 10 operating hours | Easy | Final check: check the vehicle for operating safety and take a test ride |
| Make a service entry in the KTM Dealer.net | Every 10 operating hours | Easy | Make a service entry in the KTM Dealer.net |
No maintenance items match your search.
Easy: basic tools, straightforward Easy–Moderate: varies by task — somewhere between the two Moderate: some mechanical know-how helps Advanced: specialized tools/skill, still DIY-doable Expert: significant experience required Professional: dealer or shop recommended
What's due?
Enter your current mileage (km) to see what's coming up.
Related bikes
Spot something wrong?
Tell us what needs fixing on the 2021 KTM 125 SX schedule above.