Correct answer
Periodically check chain slack and condition according to the manufacturer.
Periodically check chain slack, wear and lubrication according to that model’s handbook, with the engine stopped and the motorcycle positioned as specified. The chain needs some slack: do not tighten it until none remains. There is no universal 20–30 mm value for all motorcycles; for example, the 2016 Honda CB500F handbook specifies 35–45 mm for that model. Follow the manufacturer’s cleaning and lubrication procedure and consult a workshop if you lack the skills or equipment to adjust it.
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Periodically check chain slack and condition according to the manufacturer.
Tighten it until all slack is eliminated.
Clean it only with water and omit lubrication and inspections.
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