Here's a good question..at least I think it is..SBP's kit only uses a 17 tooth sprocket on the input side of their kit and say:
you will see ratios between 5.8 to 1 and 2.7 to 1. This is like running a 58 tooth rear sprocket in the stock set up all the way down to a 27 tooth.
Why are their ratios so different? It seems like something is amiss.
Edit: Ohhh, I think I read somewhere that the china engines have an internal gear reduction..is that right?