That's not an XS1/XS1B front wheel, missing the airscoop. Need to see if other side has the 6 vent holes. There's a recent post here *somewhere* with a very similar wheel, reported as coming off a ?-400 or ?-500 ???
Those front fork lowers DO look to be early XS1 (Non-enduro type, no fender stay ears), however, they have the XS1B fork sealcovers???