With this model the Yamaha boys at Hamamatsu took a good long look at the trail riding concept which had become a profitable piece of the motorcycling pie. This new type of motorcycle often called an enduro, was adequate on the pavement, Ok on a dirt road a play bike that extended one’s horizons. The current description would be dual purpose, as these were not full on competition machines by any stretch of a rider’s imagination. Yamaha had actually broken new ground in this essentially untapped market back in 1968 when it introduced its bestselling DT 1 250cc two stroke single, but two strokes were on their way out. In 1974 Honda came out with its four valve, OHC XL350 single and that was attracting buyers among riders who wanted a fun bike that could happily go along the highways and byways until the turn off onto the million or more miles of dirt roads the country had to offer. Yamaha America told Japan it wanted in on that market, and the engineers back in Japan had to decide whether to go forward with impressive technical advancement or stay with good understated design. The single cylinder used a two valve head and a chain driven overhead camshaft, letting the engine run up to 7,500 revolution per minute although maximum power, some 28 rear wheel horses was found around 6,000 revolution per minute. The engine design was almost square with a bore of 87 milimeters, stroke 84 milimeters 499cc in all. In a successful effort to make the engine as compact as possible, smaller flywheels were used providing quicker revs when accelerating but still a bit of that big single torque. Using a dry sump reduced the engine height with lots of oil moving around to make sure all the moving bits got properly lubricated. Oil circulation was done via two pumps, the larger of which brought the oil up from the sump and into the backbone reservoir, the smaller making sure oil got to all pertinent places, like the crankshaft and camshaft. Lots of ball bearings were used rather than having plain surfaces with metal moving on metal, the bearings eased the lubricating problems as less pressure was required.
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21 авг 2024
