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The 1975 Yamaha RD350 and 1978 Yamaha SR500 represent two chapters in Yamaha's storied history.
The 1975 Yamaha RD350 from Japan was powered by a 347cc 2-stroke twin producing 39hp at 7500rpm. Weighing 150.0kg (331 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 1975 Yamaha RD350 from Japan was powered by a 347cc 2-stroke twin producing 39hp at 7500rpm. Weighing 150.0kg (331 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
| 1975 Yamaha RD350 | 1978 Yamaha SR500 | |
|---|---|---|
| Displacement | 347 cc | 499 cc |
| Power | 39 hp | 32 hp |
| Torque | 33.0 Nm | 37.0 Nm |
| Cylinders | 2 | 1 |
| Top Speed | 165 km/h | 145 km/h |
| Quarter Mile | — | — |
| Dry Weight | 150.0 kg | 158.0 kg |
| Wet Weight | 163.0 kg | 172.0 kg |
| Seat Height | 790 mm | 800 mm |
| Wheelbase | 1345 mm | 1390 mm |
| Fuel Capacity | 13.0 L | 12.0 L |
| Gears | 6 -speed | 5 -speed |
The Verdict
Comparing these two Yamaha machines reveals the brand's evolution. The 1975 Yamaha RD350 laid the groundwork with 39hp, while the later 1978 Yamaha SR500 pushed output to 32hp. Both share equal collector appeal at 7/10. Either way, both are worthy additions to any Yamaha collection. Parts availability is moderate for the 1975 Yamaha RD350 and good for the 1978 Yamaha SR500 — an important factor for any restoration project.
About the 1975 Yamaha RD350
Yamaha released the 1975 Yamaha RD350 in 1975 with a 347cc 2-stroke twin powerplant making 39hp — a definitive standard motorcycle.
Full 1975 Yamaha RD350 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 →