The nice thing is that transmission and the 7X one both bolt right up to Honda GX31and GX35's and they generally sell for about $30.
I'd like to find a 8H big sprocket in a 70 to 80 tooth count, but I've found none so far. The twin row chain version come with some pretty old and stiff reddish grease. I think that one thing I'm going to do down the road is add a little 150# gear oil to the chaincase as the drag from that grease is pretty bad.