no pull out the spark plug or plugs, and try to turn it over. look for fluid coming out of the spark plug holes as you turn it over. if there is fluid and it turns over then its hydrolocked. if there is no fluid than its another issue.
the throttle on my 4211h will not go down past half way. it flexes the cable as i push the lever down, but it goes up fine. i have a briggs 400cc I/C the tractor was built in the mid 80s.