Thanks everyone. I did confirm today that it is the 261.
HFfarms awesome info, thank you. I will follow your directions exactly for the hydro-vac.
As for the carb. I know there are differences in the carburetor between the 235 and 261... but I haven't had any luck finding the correct replacement for the 261. I bought the new one from Mikes Carburetor Parts and they said they sell the same one for the 235 and 261 models. I guess you lose a little top end running the 235 carb on the 261 but it should still work. I also bought a rebuild kit for the original carburetor, but again same kit everywhere listed for the 235 and 261. Will have to just mess with it and see what happens.
