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I will never complain about regular bike gearing again! Spent about 4 days trying to suss out why the chain kept jumping off on the new mid drive motor, turns out it was because it wasn't looped through this teeny tiny gear, frustrating as it must have been set up wrong somehow since I got it, as gear wasn't looped through before. My hunch is the front derailleur kept the chain aligned a lot more before. #recumbentTrike #eBike #accessibleCycling
Is the motor that you got 750W? If so, it's possible that overall you may need to have something in place to add chain tension - not sure if shortening the chain a bit for the setup would help, but that might be one possibility if you have the length to do so.
I would really recommend calling ICE and talk to them about the setup, too, as a 750W motor may be too much for the drivetrain without some other supports in place, and if the chain is misrouted on the wrong side of an idler you might put the whole system at risk of a catastrophic failure mid ride.
I put a 500W mid drive on to a tandem recently (so granted, a huge bunch of drivetrain involved with it), and I think at 500W it's pretty much too much, and the chain could slip, so I limited the thing as much as possible.
Hope this is helpful - it certainly got my attention seeing the chain over the top of that idler.
@kinetix hey Kinetic, yeah you're right, my Dad sent me this instruction manual last night, they don't loop through. I'm in two minds whether to leave it as it's working 
https://www.manualslib.com/manual/1110596/Ice-2009-Trice-Q.html?page=25#manual
But a tech at ICE (or, sorry, a local dealer) could probably give you all the goods on what they'd recommend on how to resolve the issue with a mid-drive motor in place. I guess I should say too that the skipping may well have nothing to do with the motor torque itself.
Oh, and yes, the 250W motor really should be just fine. I don't know about how enforced the rules are there in your neck of the woods, but I know there's tons of non-street-legal motors (> 500W here) in use.
(And that said - I've found that the 250W mid-drive motor on my current trike moves me at least as well as the 500W rear hub motor on my last trike, now that I've got used to the shifting requirements around this sort of system)
@kinetix decided to follow your advice and tackle making the chain threaded correctly across the pulley, happily whatever was causing it to jump off the chain before has stopped now! Thanks for the advice! #cycling #recumbent #ebike
@kinetix got to the bottom of the thing that was causing the chain to catch, part of the chain was twisted so cut it off, I suspect the slightly shorter length is contributing to it no longer jumping off the chain. The twisted bit on the right next to a regular length of chain for comparison.
Two hours later and I see I couldn't even autocorrect 'resolved'.