RIEJU marathon 125 Owner's Manual page 107

Try not to over tighten the chain, as it will stretch and wear the sprockets much quicker and may dama-
ge the gearbox.
If the wheel and chain are badly aligned, this can cause the chain to come off, and severely affect the
bikes handling.
Periodically, it is necessary to clean and grease the chain. The chain is made up of many pieces which
all work together. If the chain is not maintained properly, it will wear very quickly, therefore, it is advisa-
ble to grease the chain periodically with the correct chain lubricant.
Before lubrication, it is necessary to clean the chain to remove the dirt and the mud with a brush or a
cloth and then apply the chain lube to all the chain links and sprockets.
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