A company in Germany has developed a Turbo Diesel based bike. Its called the Neander and is one of my dream bikes.
Take a look at the link below.
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Royal Enfield used to produce diesel bullets called Taurus. You'll find them in the rurals around Coimbatore and Harayana. The engines were Greaves engines, and much of everything else was directly from the Bullet.
Cheers!
Prajwal