First time Yamaha forum poster. I am looking into getting a second bike an '02 WR426. I have a line on one at an excellent price. The reason for the great price is that the bike has had a problem since new. The bike has been ridden for a total of 4 months in 2 years and only has 2 races on it. It has all the extras for desert racing and looks new. Here is the problem: It pops and surges during hard acceleration and deceleration. The owner changed the black box, plug(many times), numerous jetting combos including taking the carb off another 426 that ran great. The only thing he did not addresss is timing. I heard from a friend of his that he did change the bike to YZ timing, but am unsure of that. I heard a rumour that there were some cam issues with in '02. I KNOW this is THE forum to get the BEST advice possible on this bike, so I am asking for your expertise before I buy it. OR should I steer clear. Thanks in advance for all responses!