This is the complete carburetor used with the OS Wankel 30 engine. PACKAGE INCLUDES: 1-Pre-assembled carburetor (all metal) 1-"O"ring (rubber) 2- Screws (3mmx8mm) SPECS: Throat size: (9mm) Venturi: (5mm) COMMENTS: Customer will need to purchase the engine separately. sek/3-30-94