Yep, I have to agree with Half Crazy. If you adjust both bolts, you are assuming that you alignment is ok. However adjusting both bolts only changes tension, not belt position on the pulley. To move the belt from one side to center or whatever, you have to adjust only one side, the left, to avoid messing up the belt tension.
I understand better now about installing shims to move the pulley to one side or the other. This is something I hadn’t thought about, and I appreciate the advice there. Thanks David. However, my belt rides right in the center of the front pulley. It’s the back one that drives me crazy.
Unfortunately, there is little you can do to provide accurate wheel alignment and allow the wheel to actually be centered, as any change to the stop bolts on either side, moves the wheel and pulley. It’s not a great system, and if the bike was built with any kind of offset, you are screwed. My bike pulls to the right when I take my hands off the bars. I can’t do anything to prevent it. I have owned a total of 12 bikes in my life, and this bike is the only one I have not been able to ride hands off in a straight line.
Last week when I replaced my belt, I took the time, with the bike up on the hydraulic lift, to get the alignment nailed down. It took a lot of time and patience to get it aligned per the procedure in the service manual. This procedure is different to the one in the owners manual. It works, but you have to make a lot of tiny adjustments, and also rotate the wheel and watch where the belt is moving to for quite a long time. Just a few turns doesn’t do it.