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The 1976 Yamaha RD400 and 1980 Yamaha XJ650 represent two chapters in Yamaha's storied history.
The 1976 Yamaha RD400 from Japan was powered by a 398cc 2-stroke twin producing 40hp at 7000rpm. Weighing 153.0kg (337 lbs) and with a seat height of 790mm, it was aimed at standard riders.
The 1980 Yamaha XJ650 by contrast offered 653cc of DOHC inline-4 power, delivering 71hp at 9000rpm. Tipping the scales at 215.0kg (474 lbs) with a top speed of 190km/h (118 mph), it offered a distinct riding experience. 1970s bikes from the Japanese superbike revolution are increasingly sought after. Clean, original examples have seen significant value appreciation.
The 1976 Yamaha RD400 from Japan was powered by a 398cc 2-stroke twin producing 40hp at 7000rpm. Weighing 153.0kg (337 lbs) and with a seat height of 790mm, it was aimed at standard riders.
The 1980 Yamaha XJ650 by contrast offered 653cc of DOHC inline-4 power, delivering 71hp at 9000rpm. Tipping the scales at 215.0kg (474 lbs) with a top speed of 190km/h (118 mph), it offered a distinct riding experience. 1970s bikes from the Japanese superbike revolution are increasingly sought after. Clean, original examples have seen significant value appreciation.
Specifications Comparison
| 1976 Yamaha RD400 | 1980 Yamaha XJ650 | |
|---|---|---|
| Displacement | 398 cc | 653 cc |
| Power | 40 hp | 71 hp |
| Torque | 35.0 Nm | 56.0 Nm |
| Cylinders | 2 | 4 |
| Top Speed | 168 km/h | 190 km/h |
| Quarter Mile | — | — |
| Dry Weight | 153.0 kg | 215.0 kg |
| Wet Weight | 166.0 kg | 232.0 kg |
| Seat Height | 790 mm | 800 mm |
| Wheelbase | 1360 mm | 1440 mm |
| Fuel Capacity | 14.0 L | 16.0 L |
| Gears | 6 -speed | 5 -speed |
The Verdict
Comparing these two Yamaha machines reveals the brand's evolution. The 1976 Yamaha RD400 laid the groundwork with 40hp, while the later 1980 Yamaha XJ650 pushed output to 71hp. From a collector's perspective, the 1976 Yamaha RD400 holds the edge with a 6/10 rating. Either way, both are worthy additions to any Yamaha collection. Parts availability is moderate for the 1976 Yamaha RD400 and good for the 1980 Yamaha XJ650 — an important factor for any restoration project.
About the 1976 Yamaha RD400
Born in 1976, the 1976 Yamaha RD400 is a 398cc twin-cylinder standard motorcycle producing 40hp from Yamaha.
Full 1976 Yamaha RD400 Profile →About the 1980 Yamaha XJ650
Born in 1980, the 1980 Yamaha XJ650 is a 653cc four-cylinder standard motorcycle producing 71hp from Yamaha.
Full 1980 Yamaha XJ650 Profile →