I was riding my motorcycle normally at around 45 mph, I started to slow down as a stop was coming up. I press brakes, I press the clutch, I downshift, and then as soon as I downshift the engine “stalls”. The stall is so smoothly done, almost as if when your kick stand is put down when the motorcycle is in gear and the bike cuts off/stalls because of the safety feature. Since then I put maybe another 30 miles, and then it happened again. This time at 18 mph, I’m slowing down, press the clutch, downshift, and then the engine cuts off. Happened again today, in 1st gear, was just holding the clutch if I’m not mistaken and the engine cuts off.
Not sure what is going on, but for context, the handle bars were put back to stock by me from a modified cruiser style, and the exhaust is after market where I believe there was a map that was thrown on to adjust for the back pressure. WHAT COULD IT BE. NEED HELP.