Don't worry they will soon be getting I4 engines if they want to get on the MotoGp podium again.
...but Honda's engine is a V4. Honda went with very short connecting rods and very low heads to compact the engine and move it forward in the chassis -they basically beat Ducati at their own game, plus the seamless transmission, add a little Mark Marques...
http://www.cycleworld.com/2013/08/0...egree-v-four-engine-motogp-racing-technology/
MotoGP engine design cannot be dissociated from bike handling, the whole package has to be thought out as one.