Yamaha has traced out a very clear B wave over the past four years. The equality between the A and C legs and the top right at the double top level, almost guarantee this. Next leg should therefore be wave C of a large A-B-C flat wave 2 ( or B).
How this fits in the big picture is shown in red below. It is assumed that the stock hit an all time low sometime in 2001 or so and has done a wave 1 up. It is now doing wave 2 down.