As long as you don't need the funds for your next project, I'd say keep it. When I sold my YZ-4 a year ago, prices for used ones were down already, and with the imminent release of the SF the market will be even worse. Depending on your track and set-up, you may be substantially faster. Shaft drive and to some extent adjustable diff height can make a huge difference on carpet. At first I was not sure whether I should get another 4WD as it does not suit my driving style, but as the YZ-4SF seems to be a user friendly car with a plethora of set-up options, I guess I have no choice... Hopefully Shin will come up with a matching 2WD before long, diff access on the YZ-2 is so 2015!
