Thought you guys might enjoy this. Did a routine service on a 17 Yamaha F70 mounted on a crappie boat (1754). Interesting setup; works great for the guy who uses it. Anyway At one point I remember telling y'all how I loved the F70, how quiet and smooth it is. So here's the proof. The loudest part of it running is the pee water hitting the test tank's water surface. Little vibration that is seen on the water's surface. That is IT. Sweet little motor, inline 4 cylinder.
https://imgur.com/8X8NImw
https://imgur.com/8X8NImw