My exhaust is melting my turn signals. Any idea why this is happening? Maybe air/gas ratio is too rich? Maybe the exhaust is clogged?

https://i.redd.it/sn7yvfiv8it11.jpg via /r/motorcycles https://www.reddit.com/r/motorcycles/comments/9q26ip/my_exhaust_is_melting_my_turn_signals_any_idea/?utm_source=ifttt