How Do I Replace a Clutch in an '89 Yamaha YZ 125?

Question

And are there any special tools or anything I need to know? Please answer only if you know.

Answer 1

First purchase a shop manual before they go out of print.
http://www.motocom.com/motorcycles/
Parts diagram
http://www.bikebandit.com/partsbandit/oem-parts-nav.asp
Online Motorcycle Repair Course - Engine - Clutches
http://www.dansmc.com/indexindex.htm
Drain oil
Remove clutch cover
Remove bolts & springs #8 & 9
Take note as to the order the clutch plates come out (there are different sizes and shapes).
Change the metal plates if they're discolored (due to getting burned).
Soak the new fiber plates in the same oil you'll be using in the crankcase (you want the new plates to be saturated with oil).
Do not over tighten the bolts.
Aluminum breaks easily.
The springs act as lock washers.
Clean the crankcase and clutch cover gasket surfaces until they look brand new (or it'll leak).