I would ask if this is the carburetor you have first. since you did not provide a type number I can not be sure.
check the following:
Item #947 is getting 12 volts and moves freely. It is common for the solenoid to get clogged with old fuel.
Item#135 may be clogged or the gasket not seating properly
Item #131 should have no play in the body of the carburetor.
View your parts by type number at Arco Lawn Equipment | Home
if you need.