This is the Complete 40L Carburetor for use on the / O.S. 55HZ-H Hyper Ringed Engine (OSMG1955). / / FEATURES: Pre-installed needle valve assemblies / Rotary style / / INCLUDES: One Complete Carburetor with four arm throttle lever / One O-Ring / / REQUIRES: Installation on the engine / / SPECS: Width (at widest point): 92.5mm (3.6") / Height: 40.7mm (1.6")