Categories: Yamaha

Yamaha GX400SP (1978-79)

The Yamaha GX 400 is a motorcycle model that was produced between 1978 and 1979. It features a four-stroke, air-cooled parallel twin engine with a capacity of 391cc and a compression ratio of 9.2:1. The bike has a kick-start and can generate a maximum power of 37 hp at 8800 RPM and torque of 3.2 at 8000 RPM. Additionally, it comes with a six-speed transmission and a chain final drive. The front suspension is telescopic forks, while the rear is dual shocks. The bike is equipped with single-disc brakes both in the front and rear. It has a dry weight of 168kg, which is relatively heavy, and fuel capacity is not specified.


Technical specifications:

Make Model: Yamaha GX 400

Year: 1978 – 79

Engine: Four stroke, parallel twin

Capacity: 391



Bore x Stroke: 69 52.4 mm

Cooling System: Air cooled

Compression Ratio: 9.2:1

Induction: Carburetor

Starting: Kick

Max Power: 37 hp @ 8800 rpm

Max Torque: 3.2 @ 8000 rpm

Transmission: 6 Speed

Final Drive: Chain

Front Suspension: Telescopic forks

Rear Suspension: Dual shocks

Front Brakes: Single disc

Rear Brakes: Single disc


Front Tyre: 3.00-18

Rear Tyre: 3.50-18

Dry Weight: 168 kg

Fuel Capacity:
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