Yamaha XV1900A

The Yamaha XV1900A is a motorcycle manufactured by the Yamaha Motor Company and sold in the United States through Yamaha's Star Motorcycles division. It is the largest Yamaha motorcycle in production.[3]

Yamaha XV1900A
ManufacturerYamaha Motor Company
Also calledStar Roadliner (US)
Star Stratoliner (US touring version)
Yamaha Midnight Star (UK)
Productionfrom 2006 to 2017
ClassCruiser
Engine1,854 cc (113.1 cu in)48 degree 4-stroke air-cooled V-twin
Bore / stroke100mm x 118mm (3.937 in x 4.646 in)
Compression ratio9.5:1
Power95 hp (71 kW) @ 4,400 rpm (rear wheel)[1]
Torque123 lb⋅ft (167 N⋅m) @ 2250 rpm (rear wheel)[1]
Transmission5-speed gearbox to belt drive
Frame typeAluminium double cradle
SuspensionTelescopic forks front, rear swingarm (Link-type monocross suspension)
Brakes298 mm (11.7 in) double disc front, single rear
Wheelbase1,715 mm (67.5 in)
DimensionsL: 2,580 mm (102 in)
W: 1,100 mm (43 in)
H: 1,125 mm (44.3 in)
Seat height705 mm (27.8 in)
Weight329 kg (725 lb)[2] (dry)
Fuel capacity17 litres (3.7 imp gal; 4.5 US gal)[2]

Development

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.[3]

Engine
2010 engine design

The 1,854 cc (113.1 cubic inches) four-stroke air-cooled V-twin engine was purpose-built to deliver maximum torque at 2,500 rpm in the 55 to 75 mph (90 to 120 km/h) range used for motorcycle cruising. Set at 48 degrees, the cylinders have a four pushrod valves, twin spark plug cylinder heads,[4] with forged pistons having an Alumite coating to reduce friction and ceramic-composite-coated cylinders.[3]

With an undersquare bore and stroke of 100mm (3.937 in) x 118mm (4.646 in), the engine has a compression ratio of 9.5:1 and is the first Yamaha cruiser motorcycle to be equipped with the compact Exhaust Ultimate Power Valve (EXUP) four-stroke power valve system previously only found on their line of high performance sports motorcycles.[3]

An unusual feature of the new engine is a special 'Pent-roof combustion chamber', designed to increase the efficiency of gas flow. The engine also has counter-rotating balancers on both ends of the crankshaft to reduce the vibration typical of large V-Twins.[5]

Transmission

The engine’s output is transmitted via a wide-ratio five-speed gearbox and compact new transfer case, with power delivery controlled by a hydraulic clutch, the XV1900A Midnight Star is equipped with a belt drive system.[3]

Frame

A lightweight long wheelbase (1,715 mm or 67.5 in) frame was designed using aluminum die casting to minimize weight, with a double cradle design to provide the strength. Suspension consists of a die cast aluminum swinging arm and a hidden single horizontal rear shock absorber and large diameter front forks.[3]

Raider version

Starting in 2008, a custom version was produced in limited numbers featuring a lowered seat, lengthened front forks, a wider 210 mm rear tyre, the widest on any Yamaha motorcycle,[6] and special black finish to the engine and a range of custom fittings.[4] The Raider was discontinued for 2018.

See also

References
  1. Roderick, Tom (September 17, 2013). "2014 Star Roadliner S Review". Motorcycle.com. Retrieved June 8, 2017.
  2. "Yamaha XV1900 (2006-current)". Motorcycle News. Retrieved 4 October 2010.
  3. "XV1900 Midnight Star". Retrieved 23 September 2010.
  4. "Yamaha Raider XV1900". Retrieved 23 September 2010.
  5. "XV1900A Midnight Star". Retrieved 23 September 2010.
  6. Bastien, Pascal (2007-10-29). "2008 Yamaha XV1900 Custom S Road Test". Retrieved 23 September 2010.
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