Segment: Clasic
Production years: 1977, 1978
The Yamaha GX 400, also known as the XS 400 in other markets, was a middle-class motorcycle introduced by Yamaha in 1977 as the first 400cc four-stroke model, alongside its smaller sister, the GX 250 version.
The bike featured a cafe racer style, reminiscent of cafe racers at the time, using a square fuel tank. Later models were updated with a teardrop-shaped fuel tank and an up-handle design.
In the aesthetic department, the bike packed a round headlight on the front with instruments mounted on top, a square fuel tank, a one-piece dual seat, a dual exhaust system with a muffler mounted on each side, and wire-spoke wheels.
In 1978, when the cast alloy wheels were approved, the manufacturer quickly installed the new wheels on both GX 400 and GX 250, changing their names to GX 400SP/250SP. The tank graphics were also changed, driving up the price.
Underneath its fuel tank, the 1977 Yamaha GX 400 had installed a 391cc four-stroke parallel-twin air-cooled engine that delivered an output power of 37 hp with a peak force at 8,800 rpm and 33 Nm (24 lb-ft) torque at 8,000 rpm.
A six-speed transmission with a manual wet multi-disc clutch handled the bike's power and sent it to the rear end through a final chain drive.
The bike packed a telescopic fork on the front, twin side-mounted shock absorbers on the rear, acting as suspension, and a single brake disc on both front and rear, serving as stopping power.
engine specs | Type: | Four stroke, parallel twin, air cooled | Displacement: | 391 cm3 | Bore X Stroke: | 2.7x2.1 in OR 69 mm | Compression Ratio: | 9.2:1 | Horsepower: | 37/8800 KW(hp)/RPM | Torque: | 24/8000 lb-ft/RPM OR 33/8000 Nm/RPM | Fuel System: | Carburetor |
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transmission specs | Gearbox: | 6-Speed | Clutch: | Wet multi-discs | Primary Drive: | - | Final Drive: | Chain |
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chassis specs | Frame: | - | Front Suspension: | Telescopic forks | Rear Suspension: | Dual shocks | Front Brake: | Single disc | Rear Brake: | Single disc |
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dimension specs | Overall Length: | - | Overall Width: | - | Seat Height: | - | Wheelbase: | - | Ground Clearance: | - | Weight: | 370 lbs OR 168 kg | Fuel Capacity: | - |
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tyres specs | Front: | 3.00-18 | Rear: | 3.50-18 |
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power system specs | Power pack: | - | Nominal Capacity: | - | Maximum Capacity: | - | Charger type: | - | Charging time (normal): | - | Charging time (quick): | - | Range: | - |
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