Yamaha XS1100 Martini

Yamaha XS1100 Martini
Manufacturer	Yamaha
Production	1979
Class	Standard
Engine	Four stroke transverse four cylinder, DOHC, 2 valves per cylinder.
Compression ratio	9.2:1
Top Speed	126 mph / 202.8 km/h
Ignition	TCI additional vacuum adjusted! / electric kick starter - Witch is separated from the engine, for emergency mounting only
Spark Plug	BP6ES (NGK) or N-8Y (Champion)
Battery	GM 18Z-3A / 12v, 20 AH
Transmission	5 Speed
Suspension	Front: Telescopic fork. Rear: Dual shocks Swing arm, preload adjustable
Brakes	Front: 2x 298mm discs Rear: Single 298mm disc
Front Tire	3.50-19
Rear Tire	4.50-17
Weight	258 kg / 568.7 lbs (wet)
Recommended Oil	Yamalube 10w-40
Fuel Capacity	22 Liters / 5.8 gal
Manuals	Service Manual

It could reach a top speed of 126 mph / 202.8 km/h.

Engine

The engine was a Air cooled cooled Four stroke transverse four cylinder, DOHC, 2 valves per cylinder.. The engine featured a 9.2:1 compression ratio.

Drive

Power was moderated via the Wet, multi-disc (8 drive plates, 7 driven plates).

Chassis

It came with a 3.50-19 front tire and a 4.50-17 rear tire. Stopping was achieved via 2x 298mm discs in the front and a Single 298mm disc in the rear. The front suspension was a Telescopic fork. while the rear was equipped with a Dual shocks Swing arm, preload adjustable. The XS1100 Martini was fitted with a 22 Liters / 5.8 gal fuel tank.

Photos

Overview

Yamaha XS 1100 Martini

In 1976, in an art-work feature on streamlining, designer John Mockett had been bemoaning the fact that the motorcycle fairings produced then, fell into two categories: Dolphins: such as those from BMW and Dunstall, were good at cutting through the air but gave the rider little protection. Snow ploughs: such as Vetter gave good protection but at the expense of performance due to the sheer size of them and the increased drag.

What was needed was a combination of the two and in 1977, John was contacted by Paul Butler from Yamaha's Design & Development department in Amsterdam. He was willing to offer John 'free reign' in designing a fairing for an upcoming 1000cc plus tourer. The only stipulation Yamaha insisted upon was that the bike should remain as standard as possible. Enlisting the help of sculptor Steve Furlonger and industrial designer Dave Weightman, they set to trying to design something which hadn't been done before. The power of the engine wasn't going to be a problem so the No.1 priority was going to be rider protection. Enlisting the help of sculptor Steve Furlonger and industrial designer Dave Weightman, they set to trying to design something which hadn't been done before. The power of the engine wasn't going to be a problem so the No.1 priority was going to be rider protection. "We relied on Steve as a 'maker' but he had more to offer than that. He had a sculptor's eye, that is an understanding of 3D form and all consuming energy. By the way in the last year two of the principles in this work have died; David Bean, the test rider, and Nieto-san the chief engineer. Those guys were interested in pushing the envelope, not like today, copying existing models." - John Mockett (1999) Work soon began in the wind-tunnel at Lanchester Polytechnic in Coventry on a 1/5th scale model of the new bike. A one-piece fairing was on the cards at this stage but when a full size 'never to be run' prototype arrived, it soon became apparent that a rethink was needed because of the size of the arc drawn by the handlebars plus controls travelling from one lock to the other. An earlier 2 piece concept was adopted as this combined the potential benefits of a handlebar mounted screen with the aerodynamic stability of a compact frame mounted dolphin. After more than 100 wind-tunnel tests, two prototypes were made, one for display at the Isle of Man T.T. and the other for the launch of the XS1100 at Senegal. Initially, production was rumoured to have been by Harland & Wolff in Northern Ireland but it was Composite Laminate Products (CLP) of Durrington, Wiltshire who gained the contract. It was available in 1979 as an accessory costing £360 and came in the two colors that the XS1100 was being produced in, namely Crystal Silver and Macho Maroon. The finished fairing gave the bike: Better lights with the Cibiè Tango 55 spotlights fitted into recesses at the base of the main body. Two lockable, easy-access side pockets in the main body.

The ability to outdrag the standard XS11 (and the later 'S' model) due to the decreased drag of 15% and reduced front wheel lift of up to 32% (I'm talking from experience here) Protection for the engine in accidents (and legs too)

Source xs1100.co.uk

Make Model	Yamaha XS 1100 Martini
Year	1979
Engine Type	Four stroke transverse four cylinder, DOHC, 2 valves per cylinder.
Displacement	1101 cc / 67.2 cu-in
Bore X Stroke	71.5 x 68.6 mm
Cooling System	Air cooled
Compression	9.2:1
Induction	4x Mikuni BS 34SS Carburettor
Lubrication	Wet sump
Ignition	TCI additional vacuum adjusted! / electric kick starter - Witch is separated from the engine, for emergency mounting only
Spark Plug	BP6ES (NGK) or N-8Y (Champion)
Battery	GM 18Z-3A / 12v, 20 AH
Generator	A.C. Generator, voltage regulator, rectifier
Starting	Electric
Max Power	95 hp / 70.8 kW @ 8500 rpm
Max Torque	9.2 kgf-m / 66.5 lb-ft @ 6500 rpm
Clutch	Wet, multi-disc (8 drive plates, 7 driven plates)
Transmission	5 Speed
Primary Reduction System	HY-VO chain & gear
Primary Reduction Ratio	25/25 x 58/35 = 1.657
Final Drive	Shaft
Gear Ratio	1st 38/17 (2.235) 2nd 39/24 (1.625) 3rd 36/28 (1.286) 4th 32/31 (1.032) 5th 30/34 (0.882)
Front Suspension	Telescopic fork.
Front Wheel Travel	175 mm / 6.8 in
Rear Suspension	Dual shocks Swing arm, preload adjustable
Rear Wheel Travel	80 mm / 3.1 in
Front Brakes	2x 298mm discs
Rear Brakes	Single 298mm disc
Front Tire	3.50-19
Rear Tire	4.50-17
Rake	29º 30
Trail	130 mm / 5.1 in
Wet Weight	258 kg / 568.7 lbs
Fuel Capacity	22 Liters / 5.8 gal
Consumption Average	40.3 mpg
Braking 100 - 0	39.7 m
Standing ¼ Mile	11.7 sec / 114.2 mph 183.8 km/h
Top Speed	126 mph / 202.8 km/h