rear facing 28mm keihin

I have a italkit curve ignition as per the link
The only think i don have is the instructions and when they say they retard the ignition they dont so at what rate
they only 15 degree but at what rpm range
I would be happy to run it if i could actually know at what rate it retards

http://www.scooter-center.com/scowe...A_YAMAHA_AEROX5004&category2=CAT:CAT_ZUENDUNG

On another note its pulling around 13500 to 14000 rpm and sounds insane , the gearbox needs work as its pulling the revs down and so will have to lighten up the rollers a bit
Then i think a gear up will be next on the list