Although not explicitly stated, it’s generally accepted that the Klingons acquired warp drive, and presumably the basis for most of their advanced technology, from the Hur’q, who occupied and enslaved the Klingons for some time. However, even if we accept that as canon, there still would’ve had to have been Klingons who were like “yes, yes, we will hunt our oppressors to extinction, drink blood wine from their skulls, etc., but have you taken a look at how these engines work?!”