I was test driving a used 2003 burgman 650 and I found that the acceleration was a bit jerky. Whenever I let go on the throttle and then accelerate again, the whole bike jerks forward. Also when I let go of the throttle, the whole bike slows down significantly like it is braking. Usually when I do that on my reflex, the bike will continue to coast and not slow down. Is there anything wrong with the burgman 650 I was test driving or is this normal?