Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Yamaha Vision (XZ550) was a motorcycle produced in approximately 1982-83, though a smaller XZ400 model was available in some markets until at least 1987. It offered innovative technology in its motor and bold styling. Three slightly different models were produced: the European model, with dual front braking discs, the 1982 US model (RJ), with a single disc and the 1983 US model (RK), with dual discs and a fairing. The models also use different sparkplugs and front forks. The Vision was the first Yamaha model to feature automotive-style downdraft carburetors with the air cleaner box mounted atop the carburetors, as opposed to most motorcycles' sidedraft carburetors with their side-mounted air cleaners. While downdraft carburetors flow air into the engine more efficiently than sidedraft carburetors, the height of the carburetors and their airbox required Yamaha to design a large tunnel into the bottom of the gas tank. While the tank holds 17 liters(4.5 gallons) of fuel, it looks much larger thanks to the tunnel and suggests that the bike is top-heavy—which it is not.

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