The timing chain transmits rotation from the crankshaft to the camshaft and keeps the valves synchronized with the piston stroke. Fits 125–150 cc 4-stroke scooters. Brand: Vmotor.
The chain stretches over time: noise around the head increases, the timing goes off, and once worn a link can jump over a sprocket tooth. It is customary to replace it together with the tensioner and the damper, and to check the sprockets for wear.
