As far as I know, it won't be legal for any racing class I've heard of (except for perhaps land-speed racing, which has classes for everything). The advantage to a small displacement engine with forced induction is the same here as in cars; better fuel economy and lighter weight when you don't need big power; big power/performance when you want it. Motorcycles are already so powerful and so lightweight (compared to cars) that it's going to be interesting to see how this tech works in this context.
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