Shaft length
Very few motors of this size have 25" shafts. The 20" shafts can cavitate in larger chop. A bigger problem is backing down in chop. Hunter's motor mount is already a little suspect, so the extra leverage of a 25" shaft could be a problem under full power. This would be expecially true in a situation where the prop came out of the water then back in, creating a big surge of leverage.Jeff Peltier