Hey, brand new to riding, have a couple questions
I have rode dirt bikes for the past 3 years and have been wanting to get a street bike. So I went and passed the MSF course and then began looking for a bike. I found a good deal and bought it, its a 2013 ZX 636. It had 1200 miles when I bought it and iv'e put on around 600 since then. The previous owner already had a two brothers slip on exhaust on the bike.
The problem i'm having is the bike is spuddering only in first gear and only when I give it a lot of gas on the start. Also the exhaust is popping at various times when decelerating. I asked the previous owner if he ever tuned the bike when he put the exhaust on and he said no, so i'm wondering what I need to do to stop this. I'm pretty sure its something to do with the computer not knowing how much gas it exactly needs to give because he just slipped the exhaust on. Am I right? Oh yea and its happening around 4,000 rpm. Thanks for the help and I can provide a video of it happening if you need me to.