The 1973 Kawasaki Z1-900 RS from Japan was powered by a 903cc DOHC inline-4 producing 82hp at 8500rpm. Weighing 230.0kg (507 lbs) and with a seat height of 820mm, it was aimed at standard riders.
The 1982 Yamaha XJ900 Seca by contrast offered 853cc of DOHC inline-4 power, delivering 88hp at 8500rpm. Tipping the scales at 230.0kg (507 lbs) with a top speed of 210km/h (130 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
| 1973 Kawasaki Z1-900 RS | 1982 Yamaha XJ900 Seca | |
|---|---|---|
| Displacement | 903 cc | 853 cc |
| Power | 82 hp | 88 hp |
| Torque | 73.0 Nm | 74.0 Nm |
| Cylinders | 4 | 4 |
| Top Speed | 210 km/h | 210 km/h |
| Quarter Mile | — | — |
| Dry Weight | 230.0 kg | 230.0 kg |
| Wet Weight | 250.0 kg | 248.0 kg |
| Seat Height | 820 mm | 810 mm |
| Wheelbase | 1490 mm | 1490 mm |
| Fuel Capacity | 18.0 L | 20.0 L |
| Gears | 5 -speed | 5 -speed |
The Verdict
For pure standard performance, the 1982 Yamaha XJ900 Seca has the edge thanks to more power (88hp vs 82hp). The 1973 Kawasaki Z1-900 RS, however, excels when all-round versatility and everyday riding is the priority. For collectors, the 1973 Kawasaki Z1-900 RS commands more attention with a 8/10 collectibility rating. Parts availability is moderate for the 1973 Kawasaki Z1-900 RS and good for the 1982 Yamaha XJ900 Seca — an important factor for any restoration project.
About the 1973 Kawasaki Z1-900 RS
Kawasaki released the 1973 Kawasaki Z1-900 RS in 1973 with a 903cc DOHC inline-4 powerplant making 82hp — a definitive standard motorcycle.
Full 1973 Kawasaki Z1-900 RS Profile →About the 1982 Yamaha XJ900 Seca
Introduced in 1982, the 1982 Yamaha XJ900 Seca features a 853cc DOHC inline-4 engine producing 88hp, establishing itself as a notable standard motorcycle.
Full 1982 Yamaha XJ900 Seca Profile →