The item "Timing chain Active" is a timing drive chain for Active mopeds. The timing chain links the crankshaft to the camshaft and synchronizes valve opening with the piston position.
A stretched chain rattles (jingles, knocks) in the top end of the engine, throws off the valve timing, and the engine loses power. The chain is replaced along with checking the tensioner and sprockets. Country: China. After installation, check operation at idle and on a short test ride.
