Nothing wrong with bringing an old thread a new breath of fresh air. This topic I'm sure will come up again, just like all the oldies from the beginning.
With my "chirping" belt, for a long time, I could put a dab of silicon grease on it, and it'd quit chirping for a few hundred miles. My belt I think was unusual, as where all the kevlar string met/seam, the belt had a tad bit "S" shaped. Every round that belt would make it would chirp there.
Humorous side note: my belt chirpped so bad, that when I'd ride in a group, barn swallows would come out of nowhere and dive bomb me going down the highway. Every one in the group would see it and comment.... weird
I couldn't stand it no more, and ended up replacing my belt with the HD belt, and I haven't had any issue since.
When tightening belts on X's, I start usually too loose (so much so it'll jump sprocket), and I go back to shop and tweek it tighter. Until it doesn't jump. I know there are folks that will comment that its too loose this way. But this works for me.
Religiously from the beginning, I was using the clothes hanger trick to measure alignment from the swing arm bushing. Phil Marks (Pa), told me just roll that rear tire on my lift and see if it walks one way or the other. Roll the tire forwards and backwards and see if it walks one side or the other. Adjust accordingly.
I didn't realize that each X out there maybe just a little bit different, especially trying to align belt.... What Phil said made sense, and its not how'd I do it.
Another great idea that Phil came up with was.... "if it chirps, try turning the belt around". He had one that was a chirper, ... turned it around, chirping was gone.
So there's a couple of ideas to try.... Belts are expensive, but the chirping really does get old. Funny how some will just drive you crazy, and other X's nothing.
Bruce