I just picked up an '03 YZ450f and it is a biatch to kick. To kick it through top dead center I almost have to lift my foot up and beat down on it. Or if I press my foot on it and giggle it for a while, it pushes through. This is my first experience with an auto decompression (used to the 426 manuel lever). Could this be a problem with the auto decompression? Or does it sound like a valve problem?