Riding home from work last night when I was downshifting to stop at a stoplight my bike starting making an odd noise and started to sound like it had a V-Twin engine in it. Once I was at the light at I was at idle I heard a louder clunking sound that whenever I could hear it I could feel it in the handlebars on the throttle side. It had a slight loss of power and the idle RPM dropped from about 1500 to around 900. The clunking sound is repetitive and only happens whenever the bike is below 1500 RPM. I am trying to figure out what the issue is and any feedback would be appreciated. Thank you.