The other day while I was riding, I was approaching a gate to stop and open it, and right after I stopped, there was a loud bang, which I assumed was a backfire. After the bang, the engine kept running perfectly, and has ran great ever since and has not backfired again. The engine was warmed up. I can say that I stopped pretty quickly, so the RPMs went from high to low quickly. Is there anything that needs to be adjusted, or is this normal behavior? Did it do any damage to the engine? Thanks!