I have a 2003 Softail Standard EFI. It is about 500 miles from the 20,000 service. I have this weird vibe sometimes, it can only be felt at about 15 miles or less, you can notice it the most when at a stop. Some times it is accompanied with a knock. I have adjusted the clutch, all the fluids are good. When I put the bike on the stand, start it, put it in first with with clutch lever pulled in, the rear tire will start to spin. The knock feels like it is coming from the primary. Does anybody have any ideas on what is going on?