New machine chirps in the rain ? Is this normal? I have never had a belt drive system before. At about 85 miles it started to rain and I heard a constant chirping. When I pulled the clutch it stops. It only chirps when in gear and moving forward with the clutch engaged.
Is this normal for a belt drive, or is something in need of attention?

Phelonius

It may be that the belt is too tight.  The way to check is to grab the lower portion and if youc an rotate it 90 degrees it is the right tension.  If more, too loose.  if less, too tight.

If it is wet or was wet recently mine chirps. I have stopped using the spring loaded thing to set the belt tension. I use the twist. I also use Gulf canning wax on the belt sometimes when the chirp gets on my nerves. Downside? Chucks it on the wheel & wax on chrome is ugleeeee. I'll bet your problem is not clutch related.

The day I picked up my brand new 05 S40, it had been raining. The belt chirped most of the way home. It only does it when damp or wet. Wiping the sides of the belt with a dry cloth seems to help for a short while. Your rear tire may be a bit askew, causing the belt to rub on one or both pulleys.

Two night ago, it was extremely foggy here on the Gulf Coast of Mississippi, and when I got off work at around midnight, my belt chirpped for a few seconds also, but then quit.  I have road in the rain and never heard it, and once I got up to about 30 MPH the other night, the chirp stopped.  My belt may be a little off center, but it don't appear to be rubbing on the pullys.  If it is rubbing, it is barely touching it.  Next week, it goes in for the 3000 mile service, and I am going to have the shop check it for me, along with the annoying speedo squeek.
I still love the S40 though.     8)

Your belt may have repositioned a little during break-in as it wears into its most comfortable position. OR, the belt might not have been in its best position when it left the factory. So do the following inspection/adjustment:

Lift the rear wheel off the floor using a jack. Shift the transmission into neutral. Now you sit on the floor in back of the bike and rotate the rear wheel in the forward direction and observe how the belt tracks on the back pulley. The belt should have some clearance with each flange of the back pulley. If the belt has no clearance, or rubs one of the flanges, loosen the axel bolt and the tensioners on each side of the wheel. Using the tensioner bolt, try to dial in the belt position on the pulley so there is clearance between the belt and both pulley flanges. You must rotate the rear wheel forward to observe the tracking. The marks on each tensioner to the pivot arm should be very close to identical. Re-tighten the tensioner fasteners and recheck the tracking. If OK, re-tighten the axel bolt and check again.

I've never had this chirping problem, but I have always been careful to go through this belt tracking adjustment every time I've had to remove the rear wheel. You will have to remove the rear wheel, because the stock rear tire is schlock, and will wear out quickly. If you're lucky you won't get a puncture, but I did, and had to remove the rear tire to fix that. Note, these are tube type tires.
Also, check how your belt is positioned on the back pulley each time you inspect your bike before riding.

I've never had to use waxes on the edges of the belt, but maybe I've been lucky with the belt I got. If your belt is a little off, and won't track well, then maybe wax is the answer to reduce the flange contact friction.

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I had never heard of the 90 degree method.  I spent 20 min getting the belt to the tension the manual said.  It was tough getting the bolts on both sides tightened evenly and then have the belt just right.  I guess I can throw that out the window and just do the 90 from now on.  I have had the chirp for the last 2k miles.  Still drives me nuts because I can remember when it didn't.  If I cant fix it ill just make the exhaust lauder  8)