I have the chance to buy a crf70 for $200, now the problem. Problem is it was ran on low oil and they said the piston is froze up. The bike is in great condition and other then that problem nothing is wrong with it. Do you think I should buy the bike and if I do buy it what route should I take to repair it? Just put a 88 or 117 kit in it or go with a whole new motor? Any help would be great, what you would do?