Boosted and Ballistic: A 350-pound nitrous-fuelled W650

It might have immaculate retro style, but you wouldn't pick the Kawasaki W650 for its performance. With 50 horses on tap it's a fun enough runabout—and you could squeeze out a little more out with exhaust and intake work. But it's no wheelie machine. No one bothered telling Tom Thöring of Schlachtwerk though. Every time he builds another W650, he finds new and creative ways to extract more goodness from the long-stroke parallel twin. We've seen W650s with 58 and 70 hp roll off his bench—but this time he's pulled out literally every stop. This 1999-model W650 (now a ‘W854’)...