Yamaha_FZR1000_PRKit_1987.pdf

‘87 YAMAHA

FZR 1000

Yamaha FZR1000 Genesis lays claim to

“ultimate road machine“ title

Yamaha‘s line leader for 1987 is a sensational newcomer. The FZR1000 Genesis, a

machine that can, quite justifiably, claim to be the most sophisticated, most

technologically-advanced motorcycle currently available for road use.

lt is the embodiment of Yamaha‘s progressive thinking that has unequivocally

established the company as one of the world‘s leading four-stroke engine

manufacturers. A new concept, introduced two years ago with the highly-successful

FZ750 Genesis, links engine and chassis development programmes so that each

positively affects the other.

Central to this concept is an advanced-specification, steeply inclined, four-stroke

engine; this lay-out we call “Genesis“. The weight distribution is such that it actively

promotes good handling as well as allowing the use of state-of-the-art chassis

engineering by virtue of its configuration.

In the case of the Yamaha FZR1000 Genesis, both the engine and chassis represent

the highest level of motorcycle development.

The four-cylinder engine is an enlarged version of the 20-valve FZ750 Genesis unit

that has proved its capabilities with worldwide racing success... including the famous

Daytona 200.

This well-proven basic power unit is installed in an aluminium “DELTABOX“ chassis

originally-developed for Yamaha‘s World Championship-winning Grand Prix

machines and the YZF75O “Genesis“ endurance racers. Suspension, wheels and

brakes are also constructed to the same Grand Prix standards, so that the obvious

horsepower capabilities of the FZR1000 Genesis can be used with the full

confidence that handling and safety aspects are totally compatible with the speed

potential.

The package is completed by a full fairing with aerodynamics that have been tested

and proved to increase both air penetration and machine stability at the high speeds

it is capable of. Dual headlights and frontal air intakes in the fairing emphasise the

endurance-racer heritage of the FZR1000 Genesis. Yamaha have set out to do one

thing with this machine. To prove that the highly-advanced four-stroke engine

development with Genesis concept, genuinely marks a new beginning for motorcycle

design thinking. Optimum performance from engine, chassis, Suspension and

brakes result from the “Genesis concept“ and the Yamaha FZR1000 Genesis is a

superb example of what can be achieved.

The successful FZ750 Genesis pointed out a new direction for supersports

motorcycling. The Yamaha FZR1000 Genesis confirms that this direction was no

dead-end street.

‘87 YAMAHA

FZR 1000

Yamaha FZR1000 engine close-up:

Base unit for the FZR1000 Genesis engine is the now-familiar FZ750 Genesis 20-

valve, parallel four-cylinder, four-stroke. The FZR, however, is far from being just a

bored-out version of this double overhead-camshaft motor with its characteristic

Genesis lay-out: 45-degree forward inclined cylinder block. There are numerous

other modifications to the FZR1000 designed specifically to match its larger capacity.

Most obvious difference is still, of course, the increase in size. To arrive at the

capacity of 989cc, Yamaha have expanded both bore and stroke of the FZR. Its vital

statistics are a 75 mm bore x 56 mm stroke, compared to the 68 x 51,6 mm

measurements of the FZ750.

Bigger Valves:

All five valves in each combustion chamber are increased in size, to flow the greater

amounts of fuel demanded by the bigger engine. The triple intake valves go up from

21 mm to 23.5 mm in diameter, while the two exhaust valves are expanded from 23

mm to 25 mm.

To maintain the correct combustion chamber shape with these larger valve heads,

the valves are set at narrower angles in the cylinder head. The centre intake valve is

now set at 9-degrees and the two outer ones at 17-degrees. Exhaust valve angles

are 13-degrees.

Both camshafts have modified profiles and are driven by an automatically-tensioned

cam-chain.

Big-Bore, Downdraft Carburettors:

Feeding in the fuel/air mixture is a bank of four BDS37 Mikuni carburettors (3 mm

larger venturi size than those on the FZ750 Genesis). As on the smaller FZ, the 45 0 -

inclined cylinder block and well spaced top chassis members allow the use of true

downdraft carburetion. The inlet tract is so straight and unobstructed that it is

possible to see the piston crown through the carburettor throat when the inlet valves

are open! This, plus the gravity effect on the ingoing mixture, makes for the best-

possible cylinder filling from a normally-aspirated engine. lt‘s one of the major

benefits deriving from Yamaha‘s “Genesis“ design and 5 valve technology.

Lighter Pistons and Con-rods:

Inside the engine, the pistons, rings and connecting rods are all-new and even lighter

than last year‘s 750cc components! This cuts reciprocating weight so allowing the

engine to rev quicker with improved throttle response. One thing that is common to

both FZ750 Genesis and FZR1000 Genesis is the engine‘s bore centres. What this

means is that the FZR is no wider than its smaller cousin, making it - without doubt -

the narrowest bike in the l000cc class. Maintaining the same bore centres was

achieved by using “siamesed“ bores in the bw pressure alloy cylinder block casting,

with inserted cast-iron sleeves. This keeps the block as narrow as possible and

minimises heat distortion, and it sits on a new, metal gasket to ensure better sealing

with the crankcase.

‘87 YAMAHA

FZR 1000

Oil-Jet Piston Cooling:

To reduce piston temperatures, a new oil-jet system has been incorporated into the

crankcase. These jets direct a continuous stream of fresh, cooling oil to the

undersides of the pistons.

Oil is circulated through the engine by a dual-rotor pump and an oil-cooler is

standard equipment.

Also assisting in maintaining the liquid-cooled FZR Genesis unit at an even

temperature is a radiator 25 mm wider than the FZ750 component. Air is directed

over it by a thermostatically-controlled, electric fan that is 10 mm larger in diameter

than its FZ750 counterpart.

Digital Ignition Control:

The electronic ignition that sparks the FZR1000 Genesis engine is digitally-controlled

and operated by a microprocessor. lt delivers a superhot spark, and has a pre-

programmed advance control that matches spark timing to the engine‘s ignition

advance requirements. The ignitor box also includes the control unit for the electric

fuel pump.

Finally, exhaust efficiency and overall power are both improved by the use of a

racing-pattern, 4-into-1 exhaust system.

Strengthened Transmission

The extra power and torque of the big engine are dealt with via a five-speed

transmission that has had gear pinion sizes increased to cope with the strain. Nine

clutch friction plates (one more than on the FZ750 Genesis) are employed to deal

with the FZR1000‘s massive power on take-off, and a stronger 532 size final drive

chain is used.

Summary:

From these details, therefore, it becomes clear that, although the FZR1000 Genesis

power unit is a bigger version of the FZ750, Yamaha engineers have taken great

care to maintain perfect combustion chamber shape by narrowing the valve angles

and have made sure that in both engine and transmission aspects, the reliability of

the FZ Genesis engine is in no way compromised by the extra capacity and higher

power output.

Yamaha FZR1000 Genesis rolling chassis close-up:

The most obvious and significant item as far as the FZR1000‘s chassis parts are

concerned is the “DELTABOX“ frame, fabricated from aluminium sheet into an

incredibly-strong box-section.

This frame was originally developed for the YZR500 factory Grand Prix road racers

and has played a part in Eddie Lawson‘s two World Championships (1984 and 1986)

and countless Grand Prix wins for Lawson and the legendary Kenny Roberts. lt has

also been employed for the fearsome YZF75O “Genesis” endurance-racer to which

the Yamaha FZR1000 Genesis bears such a striking resemblance.

‘87 YAMAHA

FZR 1000

Main frame weighs only 12.2 kilos!

The main frame unit weighs only 12.2 kilos and, thanks to its construction, has

immense inherent strength around the key suspension pick-up points of steering

head and swinging arm pivot.

The forward-inclination of the Genesis engine allows the top beams of the frame to

join swinging arm pivot and steering head by the shortest, straightest route and this

guarantees the FZR1000 Genesis incredible torsional rigidity. lt is this resistance to

twisting and flexing that ensures the good handling so vital to such a powerful

machine.

Handling is also enhanced by the near 50/50 weight distribution that the bower, more

forward-positioned Genesis engine allows.

The top beams of the FZR chassis are splayed around the cylinder head of the

engine to permit true vertical downdraft carburetion and to facilitate work 011 the

motor‘s top end. Another example of how Genesis engine deliberately complements

the chassis design.

The rear end of the main frame beams slope down to the swinging arm pivot,

allowing this area below the seat and behind the engine to be utilised for fuel tank

location. Putting the fuel bad here both bowers the overall centre of gravity and

centralises the machine‘s weight mass for responsive, predictable handling.

The area occupied by the fuel tank on more conventional models is used to locate

the carburettor airbox, which is covered by the “dummy“ front section of the

FZR1000‘s tank unit. Obviously this is much lighter than the actual fuel bad and has

no ill-effect on handling.

Rising Rate Monocross Suspension:

Rear suspension is by Yamaha‘s totally-proven Monocross system and, again, is

near-identical to the Grand Prix and endurance-racer machines.

A box-section, torsionally-rigid alloy swinging arm carries the rear wheel, its

movement controlled by a single shock absorber.

The shock is linked to the arm by a system of linkages which exert pressure 011 it in

rising rate to wheel movement.

The Yamaha chassis design positions the main weight of these linkages and shock

absorber below the centre-line of the bike, which further helps in gaining the handling

and steering virtues of low centre of gravity and machine mass centralisation.

The shock absorber is adjustable for spring pre-load while the swinging arm pivot

area is a precision-made, high-strength, cast-alloy component.

Flex-free Front Forks:

Front forks have massive 41 mm stanchions that are flex-free under normal road

conditions. They have a steep caster angle of 24.670 - which is indicative of the

frame‘s high-rigidity - that translates into quick but precise steering. The forks are

adjustable for spring pre-load and provide front-end handling to racing standards.

‘87 YAMAHA

FZR 1000

Floating Brake Discs, Hollow-Spoked Wheels:

The new-design cast alloy wheels for the FZR Genesis are again based on

Yamaha‘s racing machines, featuring hollow spokes that achieve maximum strength

plus minimum weight. Wheel sizes are MT3.50 x 17-inch front and MT4.50 x 18-inch

rear. They are shod with ultra-wide, low-profile radial tyres a 120/70-VR17 V270

front and 160/60-VR18 V270 at the back. The use of a 17-inch front tyre lessens the

tendency to “turn in“ too quickly that some 16-inch front wheel machines suffer from

but still bowers the overall profile of the FZR1000. The weight distribution of the FZR,

in fact, makes it quick to react to steering without the assistance of a 16-inch wheel.

Braking systems have deliberately been built to racing standards, in keeping with the

performance potential of the machine.

At the front there are two 320 mm stainless steel discs, drilled for lightness. They

“float“ on their mountings so that they automatically centre themselves under use

and always maintain maximum disc to pad contact. Four-pot hydraulic disc callipers

with opposed pistons generate optimum braking force via semi-metallic pads.

At the rear, a single 267 mm drilled disc is used in conjunction with a two-pot,

opposed piston calliper.

Aerodynamics Aid Speed and Stability:

The full fairing shows evidence of Yamaha‘s endurance racing experience with its

dual headlights (a single headlight in Switzerland). lt is aerodynamically tested to

improve both performance and stability at high speed.

Air intakes above the headlights direct cool, dense air around the airbox, to achieve

better cylinder filling. The ducting, however, does not run direct into the airbox as the

downdraft carburettors need to draw still, rather than turbulent, air.

The bower fairing includes heat shields and ducting that keep hot air, that has flowed

past the radiator, away from the rider‘s legs.

Finally, clip-on handlebars located below the fork‘s top clamps combine with rearset

footrests to give a natural, forward-leaning riding position that keeps the rider tucked

down behind the fairing.

Summary:

In terms of chassis, suspension and braking components, therefore, the Yamaha

FZR1000 Genesis is more than well-equipped to deal with both the power output of

its advanced engine and any road or speed conditions. lt is the epitome of Yamaha‘s

“Genesis“ engine and chassis technology and of large-capacity “pure sports“

machine of today‘s roads has closer links with World Championship-winning Grand

Prix engineering.

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