Sorry, but Paul is correct, the 250 was never imported to Canada, and we only got the 400 from 91 - 93, just like the US.
As for the 400 igniter working in the 250, I don't have a clue, but if you can find the part number for yours, I can tell you if it is the same as my 400.
My next question is, did the bike ever work properly after the installation of the Yamaha igniter? If the problem developed over time, you can troubleshoot it, but if it never ran properly with the Yamaha part I would say replace it or you will just be wasting your time looking for other problems.
Scarborough is about 2-3 hours away from where I live. (known locally as Scar-beria).
Regards,
Steve