In a lovely design juxtaposition, this custom motorcycle features a pair of jet engines mounted to a frame modeled after a 1929 Harley-Davidson design. It can reach 200 MPH, and in truly Harley fashion, does so loudly. This bike, which the owner claims is the only one in the world powered with two jet engines, is currently for sale on eBay.
Link -via Born Rich
However i do not see any merits in bolting an arbirary number of model jet engines to a motor bike...
Having in mind that there is a 24 engine motorbike ...
http://de.wikipedia.org/wiki/Dolmette
there is no surprise in packing a nubmer of jets on a conventional motorbike...
However i would really appreciate to hear the sound of this very special bike produces...