Go and do the setting off in first gear then opening the throttle bit again. Once the bike has experienced the "clutch slip", put your hand on the clutch dome. If it is clutch slip, the dome will be hot. If it is the sprocket and sliding member slipping, the clutch dome will be cold.
36 4G, 37 VH, 53 ex ISDT KHA (project), 54 KH(A), Healey 1000/4 (project)
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.