Modern equivalents (like the YFZ50 or YFM90) include power cut-off tether switches and adjustable speed limiters to keep new riders safe.
Your query is a bit ambiguous, but it likely refers to one of three things:
The mention of "(100) mp4" might refer to a specific video file (perhaps 100th in a series or 100MB in size) with a title like "YFM." In this context, a "useful report" could be a video summary or analysis.
It typically features a 100cc four-stroke engine , designed for reliable, low-maintenance performance.