Hello from the Sunshower State! I was about to post a new question when I saw your topic was eerily similar. I have an '87 1200 with a D404 rear and had a D404 front. I had gone to Bike Week in Daytona a few times in March and noticed my front tire wouldn't hold air and determined it to be valves. Had to cut the front off since it had been tire slimed and I couldn't break the bead any other way. Ok, said all that to say this. Bought a Dunlop 402 off a guy on Craigslist, apparenly there's a much bigger difference between the 404 and 402 than two numbers. Before with the old tire slimed 404 I had no wobble, all was well. After with the 402, bounces like a SOB and I can't take my hands off the bars for a split second before the death wobble begins. I had the tire balanced, replaced wheel bearings, purchased steering bearings (both wheel and steering bearings are all balls) but haven't installed them yet. Since I know I didn't have the wobble before the new tire then it should be caused by the new tire, OR, did the new tire exacerbate a problem that lay dormant until recently with the steering bearings? Any input would be appreciated if anyone stayed awake long enough to get to this last sentence, thank you.