Looking at the hodakaparts website. Since mine is a model71, does the model70/70a share the same 250?

I just got a thunderdog that was my grandpa's, it was sitting for around 30ish years my buddy told me to put some ATF down the spark plug hole to attempt to free it up before I tried to get the engine turning and it wouldnt so I pulled the top end off of it and it appears there has been water in the...