Yamaha FZ750

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Yamaha FZ750
101-0139 IMG.JPG
ManufacturerYamaha
Production1985–1991
ClassSport
Engine749 cc liquid cooled in-line four cylinder
Power (physics)110 Metric horsepower (81 Kilowatt) @ 10,500 Rpm
Transmission (mechanics)6 speed
Seat height790 mm
Weight210 kg (460 lb)
Fuel capacity21 litres (4.6 imperial gallons)
RelatedYamaha FZR1000

The Yamaha FZ750 is a Sport class motorcycle that was produced by the Yamaha Motor Corporation between 1985 and 1991. The FZ750 is notable as it was the predecessor of the highly successful Yamaha FZR1000.[1]


Contents

Development


Yamaha Motor Company Ltd. released the FZ750 in 1985. The bike was popular, and competed well against others in the "sport" class of motorcycles. The machine was noticeably narrower than many contemporaries, Yamaha achieved this by placing the Alternator behind the cylinders instead of the more normal position on the end of the Crankshaft.

Design


Engine

The FZ750 uses an all aluminium liquid cooled tranverse mounted, in line four cylinder engine. The complex cylinder head is constructed in two halves with dual chain driven overhead camshafts operating twenty valves, 3 inlet and 2 exhaust per cylinder. Valve clearances are adjusted with under lifter shims.

The four 36mm Mikuni constant velocity downdraft Carburetor are mounted in a bank behind and above the cylinders and feed each cylinder through short intake Manifold (automotive engineering). Four exhaust downpipes join a box below the engine where the gases are split to exit through two silencers.

The crankshaft is geared directly to the Clutch, no Balance shaft is used. Starting is by electric starter only. Lubrication is wet sump using a Gerotor pump.

Transmission

The FZ750 uses a six-speed sequential Close-ratio transmission Manual transmission; the gear shafts are only removable by splitting the crankcase halves. The clutch is of the wet, multi plate type and is hydraulically operated. Final drive is by O-ring chain and Sprocket. A safety feature of the FZ750 is that the engine ignition is cut if first gear is selected with the sidestand down; this is commonplace on modern motorcycles.

Chassis

The Frame of the FZ750 is manufactured from Steel box-section and uses a perimeter layout, the fairing and upper rear section use separate cylindrical tubing sub-frames. The rear Shock absorber is placed vertically behind the engine and connects to an Extrusion Aluminium alloy Swinging arm via several forged aluminium rocker arms. The 16 inch front wheel is held between spring and oil damped Motorcycle fork. Later models of the FZ750 used a 17 inch Diameter front wheel.[2] The FZ750 uses twin ventilated Disc brake for the front wheel with a single ventilated disc at the rear.

Electrical system

The FZ750 features a standard 12 Volt electrical system. The alternator and starter motor are mounted behind the cylinders. Yamaha's self cancelling indicator unit is used and a variable resistance Level sensor is used to monitor engine oil contents with associated warning lights. Denso Capacitor discharge ignition is used in conjunction with two Ignition coil.

Specifications (FZ750)


Data from:[2]

FZ750
Engine 749 cc (46 cu in), 4-stroke, four-cylinder, liquid-cooled, in-line
Bore Stroke 68 x 51.6 mm
Compression Ratio 11.2:1
Fuel System Mikuni BS34 36 mm carburettor x 4
Lubrication Wet sump
Ignition TCI (Digital)
Transmission 6-speed, constant mesh
Final Drive Chain
Overall Length 2225 mm (87.6 in)
Overall Width 755 mm (29.7 in)
Overall Height 1165 mm (45.9 in)
Seat Height 790 mm (31.1 in)
Ground Clearance 155 mm (6.1 in)
Wheelbase 1490 mm (58.7 in)
Dry Weight 210 kg (463 lb)
Suspension Front Telescopic, coil spring.
Suspension Rear Link-type, gas/oil damped.
Brakes Front Dual hydraulic disc
Brakes Rear Single hydraulic disc
Tyres Front 120/80-HR16
Tyres Rear 130/80-HR16
Fuel Tank Capacity 21 L
Colours

References

  1. Brown, Roland (1999). The A-Z of Motorcycles''. London: Aness Publishing Limited. ISBN 1-84081-254-0. 
  2. 2.0 2.1 FZ750.net

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