Here is the shortcut to boyesen, dual stage reeds which do not use the reed stopper plates (there are actually 2 pieces of fibre on each side of reed valve and 1 plate to mount on bottom side off reed setup.
http://www.boyesen.com/cwo.php?store=boyesen&id=4&year=&manufacturer_id=4&vehicle_name=NSR+250&submit.x=36&submit.y=34
_________________
FILOLI - Fight, Love, Live