Dumb question of the New Year....is the function of a torque wrench to make sure you get the nuts tight enough or to not tighten too much? I tightened my oil drain nut without a torque wrench last oil change and so far no leaks....but getting those metal washer/gasket things off to put a new one on was a major pain....
A torque wrench's purpose is to allow you to tighten a fastener to the PROPER torque (tightness). Torque is defined as the force applied at a given distance from the center of rotation (radius). The radius is set by the length of the torque wrench handle.
Whenever you use a torque wrench, try to use one where the torque value required falls within 1/4 to 7/8 of the scale. Make sure you are using the right scale also. The scales can be ft-lbf (foot pounds force), or in-lbf (inch pounds force). 12 in-lbf = 1 ft-lbf. Allthough the bike is metric, you shouldn't need a metric torque wrench. Metric is N-M (Newton-Meters) I think.
You may need an in-lbf for smaller fasteners, and a ft-lbf for larger fasteners.
There are three types of toque wrenchs:
<ul>Dial: Adial torque wrench displays the torque reading on a dial/gage face mounted on the arm of the wrench. [/list]
<ul>Click: A clicker type has a micrometer style setting for the torque value you desire, and when that torque is reached, the wrench clicks to let you know, but you have to pay attention, because it is not so much heard, as it is felt in your hand.[/list]
<ul>Delflection: This is an older style that uses a sping bar that deflects when you're tightening, and has a pointer on a scale. Try to avoid these if you can. They're good for crude work, not precision mechanical. [/list]
I used to teach a class in the Navy called "General Maintenance Tools and Their Uses", plus "Diesel Engine Operation/Maintenance". The tools class is the type of information you need first, then the hands on stuff.
I hope I'm not insulting your intelligence, I'm just trying to give you enough information so you can purchase the right tools.
Good Luck!