INCLUDES: O.S. Max 49-PI Type II. 30 Wankel Rotary Engine with OS F glow plug, carburetor, muffler. This is the O.S. Max 49-PI Type II. 30 Wankel Rotary Engine. Redesigned Carburetor venturi for more airflow resulting in more power than previous Wankel engine from O.S. Max Muffler can be angled in different directions for increased mounting versatility.