I see this is a little late in the game to be saying this, but long ago I had problems with front end wobbling on my 1300 C if I let go of the bars at all. I read that this was not an issue with the 1800. I also found out that the steering head bearing size was the same but the 1300 uses ball bearings and the 1800 uses taper bearings. I got a set of taper bearings specced for an 1800 and had them put in. No more wobble since. That was about 40,000 miles ago.