the springs are not torqued very tight, the cb450 calls for about 10 ft pounds, you may want to slip a penny between the primary drive gears, (anything soft will work, even a rag, I don't recommend fingers though you can also put the bike in a high gear.
as for the assembly order..
put the one different plate in first flat side out, then it appears there may be some sort of large snap ring.. followed by friction disk then metal plate alternating. last friction disk is caped with the outer pressure plate. all friction disks should have metal on both sides of them.
you should take a quick look at an online parts fiche such as cmnsl or bike bandit to get a visual cue..
A forum community dedicated to Honda Twin cylinder motorcycle owners and enthusiasts. Come join the discussion about performance, engine builds, classifieds, modifications, troubleshooting, maintenance, and more!