Chain Maintenance; Chain Wear - KTM 250 SX-F Owner's Manual

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MAINTENANCE WORK ON CHASSIS AND ENGINE

Chain maintenance

For a long chain life, good maintenance is very important. Chains without
X-rings should be cleaned in fireproof solvent regularly and afterwards treated
with hot grease or chain spray (e.g. Motorex Chainlube 622).
No lubrication is allowed to reach the rear tire or the brake disks, otherwise
the road adherence and the rear wheel braking effects would be strongly reduced
and the motorcycle could easily lose control.
When mounting the chain masterlink clip, the closed side of the
masterlink clip must point in running direction.
Also check sprockets and chain guides for wear and replace if necessary.

Chain wear

To check the chain wear, observe the following indications:
15 KG
Shift the gear into idling and pull the upper chain strand with approx. 10-15
Kilograms (33 lb) upwards (see figure). Now one can measure a space of 18
33 lbs
chain reels at the lower chain strand. The chain should be replaced at the
latest when a space of 272 mm (10.70 in) is measured. Chains do not always
wear off evenly, therefore repeat the measurement at different places on the
chain.
NOTE:
23
If you mount a new chain, the sprockets should also be replaced. New chains
wear faster if used on old used sprockets.
Secure the screws of the chain wheel by applying Loctite 243 and fasten them
in a crosswise order. Tightening torque for nuts: 35 Nm; tightening torque for
screws: 50 Nm.
max. 272 mm
16 17 18
1 2 3