Yamaha SR400

Last crawled date: 1 year, 11 months ago

GS500 engineering lineage descends directly from Suzuki's first modern 4-stroke motorcycles. With the 1976 debut of the GS750 air-cooled inline-four, as well as the GS400 parallel-twin, Suzuki was building 4-stroke engines despite having produced only 2-stroke motors for 20 years. The Suzuki GS series soon expanded into larger and smaller four-cylinder bikes, the GS1000 and GS550 respectively, while the twin-cylinder engine was bored-out to become the GS425 twin. All of these models preserved the earliest GS engine layout: double overhead cams, 2 shim-adjusted valves per cylinder and a roller-bearing crankshaft. Yamaha has marketed the SR400 in the JDM since model year 1978, with a production hiatus for model years 2008–2009. Beginning with model year 2010, the SR400 had fuel injection and a catalyst muffler to comply with tighter emission restrictions. Yamaha began marketing the bike in Europe, Australia and the US in 2014. The SR400 has an air-cooled 4-stroke single cylinder SOHC 2-valve engine with a dry-sump, with the downtubes of the motorcycle's frame serving as the engine's oil reservoir and cooling system, thereby eliminating the need for an external oil cooler, reducing engine pumping losses, and allowing increased ground clearance as well as reduced overall width. The bike's semi-double cradle frame uses high-strength steel. The SR400 had a kick-starter and no electric start. To aid with starting, the bike had a sight glass on the right side of the cylinder head indicating the optimal cylinder position for starting, as well as a decompressor lever on the left handlebar. The fuel injection system has a throttle position sensor on the throttle body; O2 sensor in the top of the exhaust header-pipe; temperature sensor; thermo unit at the upper rear of the cylinder head; and a lean angle sensor to interrupt the fuel injection pump, in case, for example, the bike is on its side. The air filter is a disposable oil-coated paper type held in place by the airbox cover. The electrical system has an automatic cut-out to stop the engine when left idling longer than 20 minutes. The exhaust system has an exhaust pipe coated with a nano-film to prevent discoloration and includes a 3-way honeycomb-type catalytic converter to meet EU and US (50 state) emission requirements. The instrumentation includes a cable-driven analog speedometer and tachometer with a stainless steel bezel, fuel low-level indicator, engine-trouble warning, turn signal, neutral, and high beam light indicators. The left-side handlebar controls include hazard, horn high and low beam control, flash-to-pass switch and turn indicator controls. The right side controls include the hazard light switch as well as the engine kill switch. With 18' front and rear tires, the SR400 has spoked wheels with lightweight aluminium rims, front disc and rear drum brakes as well as a center stand, chromed fenders, headlight pod and grab bar. A sealed Valve Regulated Lead Acid (VRLA) battery is located underneath the seat, on its side. Earlier models had CDI ignition; post-2010 models have transistor controlled ignition (TCI). My made model, Speedometers and Headlights taken from my XJR1300 SP Model being same even in real life. #yamaha