just bought a 92 sporty with 6000 original miles. the thing sounds good engine wise, but when i'm riding and shifting into 3rd & 4th gear i get this whining noise. shifts ok but the noise is driving me nuts. checked the primary chain, all looks good. makes the noise accelerating and decelarating mostly in 3rd n 4th. i know these older harleys are natorious for strange noises, but is this normal? was looking to flip this bike , but dont want to sell it with problems! comments appreciated!