I have a problem with my '96 Sportster. When the bike is in motion (clutch engaged or not) I hear a metallic chattering sound from the primary. I know the usual problem is chain adjustment. I've adjusted it within the specs of the service manual and also tried a little tighter and a little looser. Still makes the noise. I've also replaced the adjuster shoe. Still makes the noise. The clutch seems to be adjusted correctly and the bike runs fine aside from the noise. Any help would be appreciated, I'd hate to have to take it to the dealer!