Improved power performance
• A side intake and exhaust port system adopted.
• 2-piece apex seals adopted.
• Keystone shaped side seals adopted.
• Cut-off seal adopted.
•  A lightweight flywheel adopted.
Reduced weight
• Thin walls on the side housings adopted.
•  Lightweight rotors adopted.
• Aluminum rotor housings adopted.
• Aluminum engine mount brackets adopted.
Improved driving performance
• Advanced front-midship layout adopted.
Reduced engine noise and vibration
• Oil-filled engine mount rubber adopted.
Improved fuel economy
• Bathtub shaped combustion chambers adopted.
• By-pass valve in the eccentric shaft adopted.
• Anti-wet port adopted.