My 04 rm250 has to have the bottom end rebuilt. I'm going to replace everything while I'm in there. Main Crank bearing and seals, but the crank itself I'm not sure about. I've heard its very difficult to take it apart to replace the big end bearings. Would it be easier or more cost effective to just replace the entire crank assembly with a hot rods set up? This if my first bottom end job so any tips or suggestions would be much appreciated.