The Yamaha TT600R's air-cooled, SOHC, four-stroke motor is simple, unstressed and reliable, with whopping 6000-mile service intervals. It makes short work of commuting hops across town and chugs easily across dirt, with dollops of torque. The Yamaha TT600R makes a decent 37 back wheel bhp and once fitted with 17-inch wheels makes a better streetmoto than Yamaha’s own XT660X, thanks to better fuelling.