Your rear mech arm is bent or slight play in it. That was my problem. I lent it against something when i put it the boot of my car for a while.... After that it would only shift in top 8 gears or bottom 8 depending on how i tensioned it. Drove me spare.
Your rear mech arm is bent or slight play in it. That was my problem. I lent it against something when i put it the boot of my car for a while.... After that it would only shift in top 8 gears or bottom 8 depending on how i tensioned it. Drove me spare.