Engineering:Yamaha XV1900A
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| Manufacturer | Yamaha Motor Company |
|---|---|
| Also called | Star Roadliner (US) Star Stratoliner (US touring version) Yamaha Midnight Star (UK) |
| Production | from 2006 to 2017 |
| Class | Cruiser |
| Engine | 1,854 cc (113.1 cu in)48 degree 4-stroke air-cooled V-twin |
| Bore / stroke | 100mm x 118mm (3.937 in x 4.646 in) |
| Compression ratio | 9.5:1 |
| Power | 95 hp (71 kW) @ 4,400 rpm (rear wheel)[1] |
| Torque | 123 lb⋅ft (167 N⋅m) @ 2250 rpm (rear wheel)[1] |
| 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)[2] (dry) |
| Fuel capacity | 17 litres (3.7 imp gal; 4.5 US gal)[2] |
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 was the largest Yamaha motorcycle while in production.[3]
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
The 1,854 cc (113.1 cubic inches) four-stroke, air-cooled, 48 degree 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. Each cylinder has four pushrod-activated valves and twin spark plugs.[4] To reduce friction, the forged pistons have an Alumite coating and travel in ceramic-composite-coated cylinder bores.[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
- Yamaha DragStar
References
- ↑ 1.0 1.1 Roderick, Tom (September 17, 2013). "2014 Star Roadliner S Review". Motorcycle.com. http://www.motorcycle.com/manufacturer/star/2014-star-roadliner-s-review.html.
- ↑ 2.0 2.1 "Yamaha XV1900 (2006-current)". Motorcycle News. http://www.motorcyclenews.com/MCN/bikereviews/searchresults/Bike-Reviews/Yamaha/Yamaha-XV1900-2006-current/.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "XV1900 Midnight Star". http://www.bikersweb.co.uk/Features/BikeReviews.aspx?ArticleId=131.
- ↑ 4.0 4.1 "Yamaha Raider XV1900". http://www.totalmotorcycle.com/photos/2010models/2010-Yamaha-Raider-XV1900.htm.
- ↑ "XV1900A Midnight Star". http://www.yamaha-motor.co.uk/uk/products/motorcycles/cruiser/xv1900a-midnight-star.aspx?view=features.
- ↑ Bastien, Pascal (2007-10-29). "2008 Yamaha XV1900 Custom S Road Test". http://www.moto123.com/motorcycle-reviews/article,2008-yamaha-xv1900-custom-s-road-test.spy?artid=92767.
External links
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