No, I didn't crash.
Had an exam at SFU today, when I finished it was snowing pretty heavily. The road was somewhat clear, so I decided to ride home. Spent 20 minutes in the covered parking lot doing a pre-trip check while the motor completely warmed up.
I was happily riding for the first 5 minutes or so, traction was surprisingly awesome, visibility was okay. Then it stalled while I was waiting at an intersection. No big deal.
As I continued riding, I noticed whenever throttle was closed (or could feel engine brake), the bike became very quiet, too quiet; when I gave it a bit gas nothing happened for a second or two, then all of a sudden bike would come back to life and jolt forward.
It stalled like that at least 17 times in my 30 minute ride home at every intersection and every closed throttle cruise I'd have to keep giving it gas otherwise it would stall and take at least 5 seconds to start again. No more engine brake either, had to pull the clutch while down shifting, braking and revving to keep the engine alive.
On top of that, snow covered my visor, I had about 15% visibility, the only thing I could see was tail/headlights, had to wipe it every few kilometres.
Not sure if this has to do with the 250 being naked (possibly exposed air intake, have to check on that), or carburettor settings. I rode in much colder nights before, this is by far the worst.