The 25066 or 25066s Units were not made in 1977 and production on them had stopped before 1997..
So we must assume that the engine was manufactured in 1987.
The unit engine was most likely put on a 1988 version of the snapper mower...
I have seen several references to the 1989 version of the 25066, so I pretty sure That Yours was made for the 1988 Model Year.
It was Easy to track down Not that I have all the information that I asked for including the model and serial number of the rider..
If you Start at the Top of this "Blog" you will see a complete History of our Question and answer series.
I have no way to edit your answers. I have no way to edit one of MY answers after you have seen it.
If you read closely, you will see that THIS was the ONLY time that you provided me with the information I requested..
Thank you for providing it, because I was finally able to give you what you wanted..
Here is a complete parts list and set of parts diagrams
Here is a generic repair manual that covers your unit and also helps to verify the manufacture date.
Sorry for the mis understanding, but if you see the history, I did the bes I could with what I had to work with.
Please don't hold it against Just answer..
Usually most of are so helpful, we get Bonuses. We are pretty proud of our reputaion and feedback hsitory, that we get a little protective of it.
Please use us again...