Sometimes bikes (like the Ninja 250R) are FI in Europe and Asia, but not in the US. I made this guide using the manufacturers US specifications first, and the interwebs to fill in the gaps. Yamaha’s site lists fuel delivery for the WR250F (the X is not in their model line-up as far as I can see) is:
Fuel Delivery: Keihin® FCR 37
That is a model of carburetor. That said, there are probably a ton of little inconsistencies in the spreadsheet given that most of that information is not very readily available. It’s hard to read tone in writing, but I promise you I didn’t mean the above as harsh at all, and very much appreciate people error-checking my work!
I’ll take a look at the TU later, but Suzuki’s site isn’t loading at the moment.