So, I started riding again on my sporty, but to comply with the local noise regs I put on the OEM pipes, but kept the filter since I like it's look. I put on 100+ miles already and I see that the plugs are light brown so I am guessing my jetting is good. I also noticed that my bike makes some engine area noises. The whole motor sounds like an older Singer sewing machine and sometimes when in gear and taking off I hear as if two pieces of small wood dowels were hitting eachother. clack clack and clack. I dont know that is causing that. I check the primary chain and it's within specs. I am yet to check the primary oil, but last year is was fine and no leaks were present. Am I hearing these noises because my new pipes are just too quiet. Is it something I need to worry about?