I've owned three hondas starting in the 80's. All of them did the exact same thing. They will only do it once on the average and usualy when colder temperatures or not run for a couple weeks. Thats why I stick with the hondas, my 84 250sx runs identical to my 2000 450es. They start the same, shift the same and run out the same. I wouldn't worry at all it is just something we live with.