KTM 890 Adventure R US 2021 Owner's Manual page 354

20 CLEANING, CARE
352
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Treat engine, link fork, and all other bare or zinc-plated parts
(except the brake discs) with a wax-based corrosion inhibitor.
Info
Corrosion inhibitor must not come in contact with the
brake discs as this would greatly reduce the braking
force.
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Clean the chain. ( p. 212)