Crazy Arc SR400 is the amazing work of Japanese artists “The Ugley’s”. They used motorcycle Yamaha SR400 as a basis.
Guys carefully thought about the concept of motorcycle, then fabricated a custom chassis (rigid rear suspension, the original front suspension), including the frame. Single seat is mounted on a small damper that can compensate for a little rear suspension stiffness. Homemade fuel tank mounted between the frame tubes as on vintage motorcycles of the 20s of the last century. The Japanese also used carburetor Keihin CR and catalog lighting equipment. Exhaust seems too homemade. The final touch – drum brakes and spoke polished wheels.