According to this 2005 article, there is currently just one production diesel powered motorcycle; it starts life as a Kawasaki KLR, and is intended for the NATO military:
http://www.gizmag.com/go/4272/
Egli CBX1000
http://i274.photobucket.com/albums/jj264/steelworker/stuff%202/HondaCBX6Egli1-1.jpg
http://1.bp.blogspot.com/_Q62H7x3hWII/TFX0ZCetdeI/AAAAAAAAB8A/kLuijz6tDiE/s1600/1247309185.jpg
It is a Irving-Vincent Classic Racer Number 1
http://www.irvingvincent.com/system/bike/picture2/0000/0006/IV_080803_View_A_cropped.jpghttp://www.irvingvincent.com/system/bike/picture1/0000/0006/IV_080803_View_C_cropped.jpg
Sorry, no it's not a Confederate Wraith. The Confederate Wraith is a V-twin. Here is a shot of the Wraith engine.
http://image.motorcyclistonline.com/f/firstrides/32456233+w799+h499+cr1+ar0/122_0704_06_z%2B2007_confederate_wraith_b120%2Bv_twin_engine.jpg