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The 1976 Yamaha RD400 and 1978 Yamaha SR500 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 1978 Yamaha SR500 by contrast offered 499cc of SOHC single power, delivering 32hp at 6500rpm. Tipping the scales at 158.0kg (348 lbs) with a top speed of 145km/h (90 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 1978 Yamaha SR500 by contrast offered 499cc of SOHC single power, delivering 32hp at 6500rpm. Tipping the scales at 158.0kg (348 lbs) with a top speed of 145km/h (90 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 | 1978 Yamaha SR500 | |
|---|---|---|
| Displacement | 398 cc | 499 cc |
| Power | 40 hp | 32 hp |
| Torque | 35.0 Nm | 37.0 Nm |
| Cylinders | 2 | 1 |
| Top Speed | 168 km/h | 145 km/h |
| Quarter Mile | — | — |
| Dry Weight | 153.0 kg | 158.0 kg |
| Wet Weight | 166.0 kg | 172.0 kg |
| Seat Height | 790 mm | 800 mm |
| Wheelbase | 1360 mm | 1390 mm |
| Fuel Capacity | 14.0 L | 12.0 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 1978 Yamaha SR500 pushed output to 32hp. From a collector's perspective, the 1978 Yamaha SR500 holds the edge with a 7/10 rating. Either way, both are worthy additions to any Yamaha collection. Parts availability is moderate for the 1976 Yamaha RD400 and good for the 1978 Yamaha SR500 — 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 1978 Yamaha SR500
The 1978 1978 Yamaha SR500 packs a 499cc SOHC single engine with 32hp into a standard motorcycle package from Yamaha.
Full 1978 Yamaha SR500 Profile →