Sprays, cleaning, tension and alignment belt adjustments may all help reduce the belt noise for a time at least but if the rear sprocket teeth are worn the real cure is to replace it. See page 7 of this thread for what that looks like if you are not sure. Hopefully replace with a steel or poly faced sprocket that will last longer than the rear tyre, my first one was worn out at 4000 miles. Also interested in how the poly Super Max sprocket is doing in service Michael H and anyone with a new Morgan steel one.
