As I have a 2009 YZ 250 2 stroke maybe I should find one of these kits
What do you actually get for your money, compared to an 06+ YZ250?
The reality is that the 06+ YZ125 & 250 have aged incredibly well. Their suspension and brakes are excellent and are still the same basic hardware as the current 4Ts, ergos are still modern (arguably better than the current YZF450), and the motors are still damn good compared to the KTMs'.
So what does the kit bike do for you?
Newer styling?
If that's what matters, UFO are even making new-style plastics to make the 02+ YZs look like a current YZF250... (I think its succesful, because the plastic kits make the bikes look like crap - just like a current YZF250...).