I have that now as well, but mine is under medium throttle. Pull in the clutch and roll, and it's smooth as silk. Load up on the power and it levels out. Just about medium power and it has this irritating methodical surging. I feel your pain sir.

2005 Model . Two Fast Eddy stickers , a bell and a clock . She's Lola . She tinkles and keeps time . http://s649.photobucket.com/albums/uu211/britbike05/