that is the same motor as my drz400 had with a few minor differences, such as the top end gaskets are thinner for higher compression and the carb is different, giving it an extra hp or two. i dropped my bike quite a few times trying to stunt it, and i never had any issues with cracking cases, even with the shift lever and brake pedal bending into them and sliding over gravel, etc. people say buy case protectors for that reason, but on a quad you dont need to worry about it.
I would trade if i were you. they go for 2k or more all day long here. as stated before Just make sure you put a manual timing chain tensioner in them. the stock automatic one is junk