The MK1 is orginal fitted with the "short" dynamo E3HM-LO 6V, you have written. But it has to drive anticlock, because the magneto runs clock wise (looking from drive side).
You can change the drive direction on the dynamo by changing the brushes. To test the drive direction you can "motoring" the dynamo
by connecting D+F and connect 6V + and put - on earth (for Negativ earth on bike).
Michael