Plastic timing sprocket (not gear) and synthetic rubber belt to drive the overhead. All good I guess. Personally, I popped two GC motors in the past 2 years and American Honda refused warranty on both. One was a rod through the lower end, the other was scrambled valves. Both replaced by cheap Harbor Freight motors. Hard to beat 99 bucks for a motor. Sent both the GC's to the landfill. Never an issue with the Honda OHV red motors. I have a decade old 13 horse that runs like a top.
That's why I will run my old GXV 120 on my 214SX forever. Bulletproof.