The SOHC/4 World Tour is in under way.
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I'd say that you need rotate the big 1/4 master timing plate to line up the advance marks and the F mark going from these as both are out in the same direction by similar amounts...correct on the pics?http://www.flickr.com/photos/62978085@N02/5728422510/#http://www.flickr.com/photos/62978085@N02/5730916576/#
If your timing is advancing too far/too fast it may not be a problem...it is only a problem if you experience preignition, detonation, or pinging (the pinging is the resulting sound of one or both of the first two)...but be careful!...Detonation can not always be detected by ear...you have to check your spark plugs...any good plug reading chart will give pictures of what detonation does to your spark plugs this is also happening to the tops of your pistons. I would set your initial timing spot on then road test listening for pinging, check spark plugs for signs of detonation...if none is found I wouldn't even worry about the advance being off. Here is a link to a plug reading chart...http://www.dansmc.com/Spark_Plugs/Spark_Plugs_catalog.html
If everyone took apart their advance units and cleaned 'em we'd have a lot less poor running SOHC bikes with guys 'setting' their timing with advancers stuck 'open'..... IMHO
You will need to reset the point gap on 2/3 so the fire mark and advance falls into place. Gap may be different that 1/4 but it is what needs to be done. First , put the plate in the mid position, set the gap and check timing. If moving the plate does not line up the fire and advance you will then need to fudge the gap. Anywhere from 12 to 16 will work as long as the marks line up...Larry