The damper is a guide rail that dampens vibrations of the timing chain so that it does not slap against the crankcase wall and make noise. Fits 125–150 cc 4-stroke scooters. Country: China.
It should be replaced when the working surface is worn away, deep grooves or cracks have appeared, or you hear the chain rustling and knocking at idle. Replace it together with the tensioner and check the chain: if it is stretched, it will quickly wear out the new rail again.
