How do you install timing chain on 125cc 4 wheeler?

To install a timing chain on a 125cc four-wheeler, first ensure the engine is at top dead center (TDC) on the compression stroke. Remove any necessary covers to access the timing chain and sprockets. Align the timing marks on the crankshaft and camshaft, then place the new timing chain around the sprockets, ensuring it fits snugly without slack. Finally, reassemble any removed components and check for proper alignment before starting the engine.