Yes ,a bit of a skew ball that one. Had me fooled as well for a few minutes but that was because i had three new bits in hand and two came off. That's why i'm waiting for a second new clutch assembly coming from the states. The Previous owner has destroyed the clutch basket on my CT3. There's a large trench embedded into the outer basket inner face.

It's as you have it in the pics up the page. Bearing comes with a reasonably thin washer for the bearing to run against otherwise the needles are running on a cast center of the basket which is no good. Sits on the step of the center sleeve, call it spacer, & thick washer sits up to the spacer giving running clearance for the bearing--in theory!!. Unless things have been overtightened or something over te years & it'll then lock the center from free wheeling. So when the center nut is fully tightened, make sure you can spin the center by hand easily.

Sorry for causing the washer confusion (and hi-jacking osageorange's thread). I was asking about the large washer that goes on first (not the washers next to the bearing). The consensus among ebay sellers is that the large (1st on) washer is 31mm (OD), 20mm (ID) and 3mm (thickness). I going to guess that the Yamaha service manual cross section diagram is indicating that you can put more than one washer first as an adjustment but only one is required. Thank you to all who offered their advice and help.