The 1966 Kawasaki W1 650 from Japan was powered by a 624cc OHV vertical twin producing 50hp at 7000rpm. Weighing 200.0kg (441 lbs) and with a seat height of 800mm, it was aimed at standard riders.
The 1972 Kawasaki Z1 900 by contrast offered 903cc of DOHC inline-4 power, delivering 82hp 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. 1960s motorcycles capture the era of cultural revolution and racing heritage. Iconic models from this decade are among the most desirable classics.
Specifications Comparison
| 1966 Kawasaki W1 650 | 1972 Kawasaki Z1 900 | |
|---|---|---|
| Displacement | 624 cc | 903 cc |
| Power | 50 hp | 82 hp |
| Torque | 49.0 Nm | 73.0 Nm |
| Cylinders | 2 | 4 |
| Top Speed | 170 km/h | 210 km/h |
| Quarter Mile | — | — |
| Dry Weight | 200.0 kg | 230.0 kg |
| Wet Weight | 215.0 kg | 250.0 kg |
| Seat Height | 800 mm | 820 mm |
| Wheelbase | 1420 mm | 1490 mm |
| Fuel Capacity | 15.0 L | 18.0 L |
| Gears | 4 -speed | 5 -speed |
The Verdict
Comparing these two Kawasaki machines reveals the brand's evolution. The 1966 Kawasaki W1 650 laid the groundwork with 50hp, while the later 1972 Kawasaki Z1 900 pushed output to 82hp. From a collector's perspective, the 1972 Kawasaki Z1 900 holds the edge with a 9/10 rating. Either way, both are worthy additions to any Kawasaki collection. Parts availability is moderate for the 1966 Kawasaki W1 650 and good for the 1972 Kawasaki Z1 900 — an important factor for any restoration project.
About the 1966 Kawasaki W1 650
Kawasaki released the 1966 Kawasaki W1 650 in 1966 with a 624cc OHV vertical twin powerplant making 50hp — a definitive standard motorcycle.
Full 1966 Kawasaki W1 650 Profile →About the 1972 Kawasaki Z1 900
The 1972 1972 Kawasaki Z1 900 is a 903cc four-cylinder standard motorcycle that became one of Kawasaki's most memorable motorcycles of the 1970s.
Full 1972 Kawasaki Z1 900 Profile →