The Suzuki DR-Z400SM is a street legal bike for serious dirt bike enthusiasts. Its not uncommon to take the SuperMoto down a twisty forest trail as well as a tight canyon corners. Its 398cc liquid-cooled, four-stroke engine provides strong low-rpm torque and crisp throttle response for any of these occasions. They key difference from the DR-Z400SM and the DR-Z400S is the inverted forks. Inverted front forks contribute to less unsprung weight and improved overall handling. Engine Features may include: Automatic decompression system for quick/easy engine starts. Compact 4-valve cylinder head with 36mm intake valves, 29mm exhaust valves, narrow 28-degree included valve angle and shim-under-bucket valve adjustment system. Electric start with lightweight starter motor and a compact 6.5 amp maintenance-free battery. Forged aluminum piston is 10 percent lighter than a cast piston and receives additional oil-cooling to the piston crown through a crankcase oil jet. Lightweight 398cc, DOHC, liquid-cooled, dry-sump engine produces strong, tractable low-rpm power. SCEM-plated cylinder (nickel-silicon-phosphorous) is lighter and more durable than an iron liner with excellent heat transfer properties. Smooth throttle response with a Mikuni BSR36 CV-type carburetor fed by 6-liter airbox. The left side cover has quick-release fasteners for easy access to the air filter. Thermostatically controlled cooling fan mounted to the left radiator helps maintain consistent operating temperature in traffic.