Time before last my bike I was running great and then the next time I took it out It was running like crap it was also about 30° colder. Temp determines what will Run like. Have you had any temp change in your area!
Once I rode my RM in 34 degrees, don't think it ever ran better, until it spit a crank bearing. Now I don't ride it unless it's above 40 degrees, I could jet it for the last two weeks of each season, but I'm not inThe mood for that usually.