I'm quite new to riding and I recently purchased a Ninja 500r off of Craigslist. The bike runs very well, but there have been 2 instances where I would start it, put it in 1st gear, then it would die as I slowly let go of the clutch. Even though I had the bike in 1st gear I realized the bike was actually still in neutral (the neutral light was off) because I was able to roll the bike forward and back. After turning the bike on and off a couple times, starting and turning it off, and switching between 1st gear and neutral, and walking it around while in neutral, I was able to get it into 1st gear and back to normal. Does anyone know what is happening and why it's happening? I appreciate any and all input. Thank you.