Hi Steve
Don't know if you ever got an answer for your question my husband justed fixed ours we have the same mower our model number is a 56150 and serial number 700000-7999999
i went to https://homeownersolutions.toro.com
put in model number and serial number, its operator manual hit purchase but its free the carb is on page 18 of 28 there is a diagram for it thats how my husband knew where the things went
hope this helps.
Carol
July 2008