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Yamaha SR400 & SR500

The Yamaha SR400 (1978–2021) and SR500 (1978–1999) are single-cylinder, air-cooled, two-passenger motorcycles manufactured in Japan by Yamaha Motor Company as a street version of the Yamaha XT500, with a standard riding posture and styling recalling the Universal Japanese Motorcycles of the 1970s. The two models differ by their engines: the SR400 engine has a lower displacement, achieved with a different crankshaft and shorter piston stroke and both models feature only kickstarting, i.e., no electric starter.

SR400
to reduce emissions. 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, 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). ==SR500==
SR500
The 1978–1979 US version of the SR500 had front and rear disc brakes while the 1980–1981 models had a front disc and rear drum brake, while the European 78–79 models had spoked wheels, front disc and rear drum brake. Cast aluminum wheels on US models (rear disk brake) for 78-79 were not tubeless applicable while (drum brake) for 80-81 were stamped tubeless applicable and so equipped. By the end of 1981, the SR500 was discontinued in the US market, while continuing in Europe and Japan. The model ended production in 1999. The SR500 employed a slightly modified version of its large single-cylinder from the XT500/TT500 and had electronic ignition as well as a handle bar mounted compression release lever to make kick starting much easier. The SR500 won Moto of the Year award twice from Motorrad, the German motorcycling magazine. ==Notes==
Source: Wikipedia ↗
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