The "270" model just doesn't list on online parts list that I can see. The 270 and 300 use the same motor so I would assume the same drive. One fin broken should not be an issue. My Grandson old 90 has two fins broken and has not caused any over heating problems with the belt/CVT system. I know, I am just like you, it would be stuck in the back of my head the whole time, lol.