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A tube ensures flow of oil from the reservoir to the oil pump. This system is commonly used for motorcycles as it eliminates the need of pre-mixing fuel and two-stroke oil. Vespa is an example where pre-mixing of two-stroke oil is required. Automatic lubrication was introduced for motorcycles by Velocette in 1913. [1] An example of application ...
Downdraft carburetors were adopted for improved gas flow, but, for motorcycles, a perceived disadvantage was that the intake airbox was above the engine, taking up space from the fuel tank, rather than being sited conventionally behind the engine. However, this apparent disadvantage was an advantage as it allowed for pressurization of the airbox.
The Yamaha MT-07 (called FZ-07 in North America until 2017) is a MT series standard motorcycle or UJM [8] with a 689 cc (42.0 cu in) liquid-cooled 4 stroke and 8 valve DOHC parallel-twin cylinder with crossplane crankshaft, manufactured by Yamaha Motor Company from 2014 and US release in 2015.
The Yamaha XV1900A cruiser was developed to exploit the large displacement end of the market for large cruisers.Yamaha had a well established range of big "Star" cruisers which went up to the Wild Star 1600 cc but there was a need to redesign the engine to meet anticipated exhaust emissions regulations and the opportunity to update the styling, which had remained largely unchanged for a decade.
The YM1 featured an oil-injection system that fed oil to the carburettor intake, the oil flow increasing as the throttle was opened. This gave the motorcycle sufficient lubrication for the crankshaft, cylinders, connecting rods, and pistons without requiring premixing of the oil and gas and with reduced use of oil.
The Yamaha FZR600 engine was slanted forward in the frame. This was the basis of the Genesis engine and Delta Box frame concept, and helped to lower the center of gravity and help centralize mass. This layout allowed the real fuel tank to sit behind the cylinders, low between the frame rails, and further aided with lowering the center of gravity.
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The Yamaha Tracer 900 (FJ-09 in North America; MT-09 Tracer in Japan, South America, Australia, and New Zealand) is a sport touring motorcycle first offered in 2015. The 3-cylinder crossplane engine comes from the MT-09 (FZ-09 in North America).