Last year they signed Robbie Malinoski, who was the reigning Pro Stock and Pro Open champion, how much better do you want?
The fact is that Malinoski didnt perform (other than that 1 win) and Yamaha is moving on with new riders who they feel may be up to the challenge.
Boss Racing wanted too much money, so Yamaha went elsewhere.
They will get there, its just going to take time. Think about it: Polaris, Cat and Doo have had decades of experience in developing their 2-stroke snocross sleds, Yamaha has 1 year of experience perfecting an all-new type of snocross sled.
Ive talked to some people who were at Duluth and they claim that this year's mod sled is much faster than last year's was. Just as their production 4-stroke sleds have, Yamaha's snocross 4-strokes will get better and better every year and its only a matter of time before they are winning races and championships.
Look at it this way too: let everyone else hold onto 2-strokes for as long as they can. When the emission laws finally kill-off 2-strokes, everyone else will be scrambling to develop 4-strokes whereas Yamaha will have a lineup of proven, dependable and very fast 4-stroke sleds.