I have a 1991 Honda CR80 that quit me. I have pulled the carb, head, exhaust, cylinder and piston (thinking I´d take this opportunity to do a top-end rebuild). It was then that I noticed the Piston Rod, if you try to move it side-to-side, has some obvious movement - I don´t believe there should be ANY movement side-to-side - so does that mean I need a new bottom end (?) If so, I´ve never pulled an engine off a bike before, or \\