Yamaha XV1900A
| File:Yamaha Midnight Star.JPG | |
| Manufacturer | Yamaha Motor Company |
|---|---|
| Also called | Star Roadliner (US) Star Stratoliner (US) Yamaha Midnight Star (UK) |
| Production | since 2006 |
| Class | Cruiser |
| Engine | 1,854 cc (113.1 cu in) 4-stroke air-cooled V-twin |
| Bore / stroke | 100mm x 118mm (3.937 in x 4.646 in) |
| Compression ratio | 9.5:1 |
| Power | 89.04 hp (66.40 kW) @ 4,500 rpm |
| Torque | 155.10 N·m (114.40 lbf·ft) @ 4100 rpm |
| Transmission | 5-speed gearbox to belt drive |
| Frame type | Aluminium double cradle |
| Suspension | Telescopic forks front, rear swingarm (Link-type monocross suspension) |
| Brakes | 298 mm (11.7 in) double disc front, single rear |
| Wheelbase | 1,715 mm (67.5 in) |
| Dimensions | L: 2,580 mm (102 in) W: 1,100 mm (43 in) H: 1,125 mm (44.3 in) |
| Seat height | 705 mm (27.8 in) |
| Weight | 329 kg (725 lb)[1] (dry) |
| Fuel capacity | 17 litres (3.7 imp gal; 4.5 US gal)[1] |
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.[2]
Contents
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.[2]
Engine
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,[3] with forged pistons having an Alumite coating to reduce friction and ceramic-composite-coated cylinders.[2]
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.[2]
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.[4]
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 featuring a four-step adjustable lever. For quiet operation together with low maintenance requirements, the Midnight Star is equipped with a belt drive system.[2]
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.[2]
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,[5] and special black finish to the engine and a range of custom fittings.[3]
See also
References
- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
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Wikimedia Commons has media related to Yamaha XV1900. |
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