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The XS400 had a four-stroke, air-cooled, overhead-cam straight-twin engine with a 180° crank angle, which reduces linear vibration at the cost of some axial vibration. The 392 cc (23.9 cu in) engine produced 36 bhp (27 kW) @ 8100 rpm. [citation needed] Yamaha XS400 in Cameroon (2019).
The 1970 model was designated the XS-1. [4] Subsequent Yamaha XS650 models [5] were XS-1B (1971), XS-2 (1972), then TX650/XS2B (1973), TX650-A (1974), XS650B (1975), XS650C (1976), XS-D (1977), XS-E (1978), XS-F (1979). 1979 was the last year of the so-called "Standards" (an unofficial term commonly used to differentiate it from the "Special," which has pullback bars, a teardrop tank, and ...
A transverse engine is an engine mounted in a vehicle so that the engine's crankshaft axis is perpendicular to the direction of travel. In a longitudinal engine configuration, the engine's crankshaft axis is parallel with the direction of travel. However, the description of the orientation of "V" and "flat" motorcycle engines differs from this ...
The Yamaha XS Eleven motorcycle, also called XS 1100 and XS 1.1, is a Japanese standard produced from late 1977 (MY1978) to 1983, powered by an air-cooled 1,101 cc (67.2 cu in) 4-stroke, DOHC inline four-cylinder engine mounted transversely in a duplex cradle frame with swingarm rear suspension, shaft drive, and telescopic forks.
Yamaha attributed the problem to excessive heat build-up in the engine and a lack of machine durability. [5] In the TX500 excessive heat build-up promoted warped valve seats and cracked cylinder heads. [6] Its exhaust ports were re-shaped on later engines to improve heat dissipation. 1973. TX500 is introduced. Model code is 371. Fuel tank is ...
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Fuel petcock on a 1978 Yamaha XS400. Most older motorcycles have a three-position fuel petcock valve (known as a "petrol tap" in the UK) mounted on or nearby the fuel tank to control the supply of gasoline: on, off, and reserve. The reserve position accesses the bottom portion of the fuel tank.
The first known straight-twin engine was a variant of the Daimler Motors' Phoenix engine introduced in 1895; these engines were used in Panhard cars that year. [43] Another early straight-twin engined car was the 1898 Decauville Voiturelle , which used a pair of cylinders taken from a de Dion model mounted fore and aft and positioned below the ...