When I did mine, number 13 was just tight, not big ol torque wrench tight, but just snugged up.
All 17 does is to keep 14 from moving, so snug is okay.
14 pushes against 25 which pushes against 24 and snugs up against 20. In the manual it says how to do this, but it describes two different ways.
Loosen 17 with a wrench while holding 14 with a screw driver. Make sure your pointer on the left side case (where your clutch cable meets the engine) is pointing at the hash mark on the case. Then hold 17 with a wrench while you screw in 14. You'll see the pointer on the left side move when number 14 is tightened correctly.
The other way the manual tells to do it is to loosen the cables and push the pointer with your hand all the way forward, then screw in 14 until the pointer is lined up. This method didn't really work for me. I like to get the pointer close, and then snug 14 up against it just until the pointer moves.
Whew, thats a lot of numbers. Hope it makes sense and I really hope I kind of answered your question.