Mine might have been different but on a ’75 70 horse I had, I was told it was a shock absorber to prevent the motor from flipping into the boat if it hit something and also to prevent it from slamming down into the transom when the prop caught the water again. Originally it was fluid filled and a new one at my dealer was around $400 twenty plus years ago. After the sticker shock went away, I unscrewed the end so I could replace the bad O rings and filled it with oil. It worked fine after that right up until I sold the boat.
To save your back, you need one of these tilter thingies.
https://www.amazon.ca/Dotline-Adjustabl … B0000AZ878
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