Originally Posted by richp
Most of the "jackass" type mounts are rated in pounds -- that is, the straight weight of the motor. I don't know that I've seen any mounts (that type or otherwise) that are rated for torque or other characteristics.
If you had a specific motor and mount type that you were considering and would share here, there may be folks here who have used it, and could chime in.
Actually, the jackasses can also be categorized by horsepower limits. I find that sort of unuseful, since a 25 hp four stroke weighs a lot more than a 25 hp two stroke. And the torque characteristics of the two are quite different.
I have run a 25 two stroke hp motor clamped directly to a stock NRS cat yoke on a 16' boat. I have run the Grand repeatedly with an 18 hp four stroke - much heavier - on a jackass on a modified NRS cat yoke on a 20' Jacks El Tigre Grande.