I got a 96 foreman 400 that had fuel coming out the back of the carb. i rebuilt it fresh and did a valve job but still same thing. then i noticed the valves opening at wrong time. so i took front of engine off and noticed the engine was 180 degrees out of time. how long should the cam chain be? with chain tensioner all the way tight the chain kinks when i turn it over. and it skips teeth on the cam gear. all my inside stuff isnt wore at all. except the chain of course.