An electronic controller variably controls the center of an operating angle of an intake valve as follows: when an engine load factor is equal to or higher than a threshold in a low load operation, the electronic controller advances the center of the operating angle with a decrease in the engine load factor. The ball is slidingly engaged with the baseball bat such that the baseball bat hitting end is inserted through a bore through the ball, the ball can be tossed into the air in front of the batter with a flipping motion of the bat, and the batter can strike the ball with a batting motion to deliver the ball into the field of play. The bicycle can have a pair of frame arms extending down from the frame with the steering arm between the frame arms and adjacent one of the arms so the front wheel is located between the arms. A block transfer to a selected plurality of segments in the memory circuit is initiated. The gap may have uniform width along its length in the radial direction, while in a direction parallel to the rotor axis it may be discontinuous or have variable size to create flow paths for gases.