Close the petcock. Fire it up and use up most of the fuel in the carbs. Then tip the bike up vertical and rest it on the grab bar. Look at the bottom of the frame. It's not supposed to be symetrical, but you should be able to see if it looks bent. If that looks good, set it back down on a flat, level floor and get out the level and the tape measure. Start at the back. Adjust the rear tire air pressure so that the axle is the same distance from the floor on both sides. From there, work your way forward with your tape measure and level. Your problems may not be with the control arms or spindle. If the frame checks out, then start measuring the A arms.