Hi,
The Transalp is known to have CDI problems sometimes because the seat bends down over the years and breaks off the conector plug while the CDI are standing upright...you can check one of them if your rpm clock goes to 0 while loosing power
To check the other CDI just replace them with each other and watch the clock again.
The baaaam baaaaam sound you descripes can be unburned fuel comes together and finaly burnes with hot gas from the other cylinder in the exoust pipe...
more help you will find at http://www.transalp.de
Good luck, Tobi
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