Harley-Davidson (NYSE: HOG) is scheduled to report third-quarter earnings on Oct. 23, and investors should brace for things to turn ugly. The period is typically among the worst-performing quarters of the year, second only to the winter-weary fourth quarter, and there's no reason to believe the motorcycle maker is about to change results this year.Below are some areas Harley-Davidson investors should watch to gauge just how bad the situation is getting.Image source: Getty Images.Continue reading