Charon
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My '07 S40 belt does that, too. It chirps on acceleration, and the chirp comes from the outboard flange of the drive pulley. I tried loosening the belt per Forum recommendations, and I tried adjusting it using Suzuki's gauge. The pitch changes, but it doesn't go away. As a little bit of an experiment I tried seeing how much belt adjustment it took to go from the 90-degree twist to the gauge adjustment, and it happened for me in less than one turn of the belt adjustment bolts. I adjust by counting "flats" on the bolt head, so I can count the same number on both sides and keep them even. It took five "flats" to go from the 90-degree twist to the Suzuki gauge setting. Six "flats" is one turn of the bolt.
I live outside town, and the shortest possible gravel road to my house is 2.5 miles from the pavement. There is no way possible to keep the belt clean. On the theory that a toothed belt cannot slip unless it is exceedingly loose, and that lubrication (NOT RECOMMENDED) probably cannot make it slip, I tried Liquid Wrench spray lube with PTFE. Its solvent quickly evaporates leaving a whitish coating. That worked for a few days, and the squeak returned. I then tried a Dupont spray lube containing Teflon (PTFE) and moly. It is sold as a chain lube safe for O-ring chains, and dries non-oily. That has cured the squeak for a few hundred miles. I am on a vacation trip and don't have the can handy, so I can't describe it further. You try this at your own risk, but so far it seems to be working for me. I got it at an Ace Hardware store, not a bike shop. When I get back home in a few days I'll provide a fuller description, if anyone cares.
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