$2k I would buy it.     $5K I would roll the dice.     

I was just thinking along the same lines from an automotive side - spin the dice and if you are worried about it, do a rebuild when you hit the mark.  surprised none of the poo guys have commented on the longevity of the motor though.  I know my 2 stroke cats I’d never consider it - only issue I’d have in the back of my mind is possible issue with the display, not sure it has the good or inexpensive one, and again, how often do they fail, does warranty cover that even and what is a replacement. 

I guess depends how fussy you are.  Just had a dodge ram blow a hemi.  Used motor replaced was around $6500.  Would you spend anywhere near that to just buy and install a used motor in a sled?  

Woke up to blue skies and a few cms of fluff to clean up now cloudy and snowing again heard OPP pulled plow off roads in Wellington county due to poor weather  lake Conestogo yellow again today  things starting to open up 

They can be pricey to fix, shop labor rates alone are pretty high and parts aren’t cheap anymore.   would depend on the cost of the warranty, limitations on coverage, and how much risk I am prepared to take.