my 90 cr 125 has 6
and the differnce between a close ratio and a wide ratio, is this,
a bike w/ 5 speeds will need to shift less than a bike w/ 6 speeds if all other variables are the same ie:sprocket sizes, track conditions, rider weith and ability etc.. b/c the gears in the tranny is not as close together in tooth count.
the yamha wr is a yz except it is called a WR b/c of
Wide Ratio, see
same with the CR honda calls them CR's b/c close ratio tranny is supposed to be implied.