mrc

I have a 2007 Royal Star Venture and have a pulse what feels like the front tire. At 50Km (30 miles)/hr on new pavement and going straight the bike front end pulses up and down not a wobble side to side. The dealership has checked the driveshaft, the bearings in the steering and I have replaced the two tires. It has improved somewhat but I can still feel it. Has anyone had this problem and can you suggest what I need to check next?