Well we are all guessing but being the bike is a 02 it just may be possible that the compensator is going bad. Not saying that there isn't other issues that can cause the problem but it still wouldn't hurt to check the comp. Also when you have the primary cover off you can check everything inside the primary. Hell it could just be a worn out primary chain tensioner and the primary chain may be binding up.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.