You can just see the spark plug, which is not in the middle of the head, it is to the right side of the head, and angled toward the back of the mower, also, the cooling cowl has a protrusion in the end, to accommodate the decompression valve, as it went out past the bolts when mounted to the 125cc.
I'm also fairly certain that the sports was never traditionally released with the green cowl, just the 125.