It's for sure that it's a Sachs engine .You will need access to the face edge of the cylinder base flange to get the cylinder # . 44ZN is a 3.2 , 47ZN is a 3.7 and 49ZN is a 4.2 The numbers should be located just behind the flywheel shroud. You may need to unbolt the cylinder to raise it up enough to get to the numbers . I'm fairly certain its a 3.2 .