I just purchased an 08 ninja 250 from a friend in California. I believe its running a bit rich, some friends have told me I need to have it re-jetted, other tell me I simply need to play with the mixture screws. It runs pretty well as it is, but it starts on the first crank with no choke and bogs when given hard throttle which, along with the mile gain in altitude, makes me think the carbs need a little work. Thought I'd get a few opinions here. If you think it does need to re-jetted, I'd also appreciate recommendations on where to have it done.