That's crazy. I never noticed anything, and never seen anything like it. I just be careful when peeling the sliver seal off the oil bottle, to make sure it don't fall into the oil.
Check the valve clearances, poor starting could be a result of tight valves. Change spark plug, or check and clean spark plug.
It also could be since you have no box? That was a joke.
I haven't rode for a month, and the other day I went out there, after about 3-5 laps I was back in action, and even hitting jumps with more air and distance than ever before, it will come right back to you man, don't even worry about it.