Yamaha FZ750

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Yamaha FZ750

Manufacturer	Yamaha
Production	1985–1991
Class	Sport
Engine	749 cc liquid cooled in-line four cylinder
Power	110 PS (81 kW) @ 10,500 rpm
Transmission	6 speed
Dimensions	L 2225 mm W 755 mm
Seat height	790 mm
Weight	210 kg (460 lb)
Fuel capacity	21 litres (4.6 imperial gallons)
Related	Yamaha 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]

1 Development
2 Design
3 Specifications (FZ750)
4 References
5 Related content
6 External links

[edit] Development

Yamaha 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.

[edit] Design

[edit] Engine

The FZ750 uses a four cylinder in-line layout and is liquid cooled. Twenty valves are operated by chain driven double overhead camshafts, valve clearances are adjusted using shims. The four constant velocity carburettors are mounted in a bank behind the cylinders and feed each cylinder through short intake manifolds. 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 counter balancer shaft is used. Starting is by electric starter only. Lubrication is wet sump using a trochoid pump.

[edit] Transmission

The FZ750 uses a six speed sequential close ratio gearbox, the gear shafts are only removable by splitting the crankcases. The clutch is of the wet, multiple-disc diaphragm spring type and is hydraulically operated. Final drive is by O-ring chain and sprockets. 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.

[edit] Chassis

The frame of the FZ750 is manufactured from mild 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 extruded aluminium alloy swinging arm via several forged aluminium rocker arms. The 16 inch front wheel is held between spring and oil damped forks. Later models of the FZ750 used a 17 inch diameter front wheel.^[2] The FZ750 uses twin ventilated disc brakes for the front wheel with a single ventilated disc at the rear.

[edit] 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 gauging system is used to monitor engine oil contents with associated warning lights. Nippondenso Transistor Controlled Ignition (TCI) is used in conjunction with two coils.

[edit] 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