Torque figures for all fasteners are carefully worked out. They depend on the fastener grade, how they are done up, lubrication and material under the fastener. This is true for everything. Ford have a document which runs to some 15 pages for critical fasteners (I jest not!)
The figure of 92 ft.lbs, which is equivalent to 124Nm which is mid range for a 8.8 grade M14. I don't know what size Parajet use to hold the prop on (6mm or 8mm) but doing it up that tight will a: crush the prop & b: shear the bolt.
Maybe it's a fastener deeper in the engine on the prop shaft which you don't normally see?