VS
The 1981 Kawasaki GPz550 and 1964 Norton 650SS both compete in the sportbike segment, offering riders distinct interpretations of the formula.
The 1981 Kawasaki GPz550 from Japan was powered by a 553cc DOHC inline-4 producing 58hp at 9500rpm. Weighing 194.0kg (428 lbs) and with a seat height of 800mm, it was aimed at sportbike riders.
The 1964 Norton 650SS, hailing from United Kingdom, by contrast offered 646cc of OHV twin power, delivering 49hp at 6800rpm. Tipping the scales at 175.0kg (386 lbs) with a top speed of 185km/h (115 mph), it offered a distinct riding experience. 1980s motorcycles are the rising stars of the collector market. Early sportbikes and final-generation air-cooled models are gaining strong interest.
The 1981 Kawasaki GPz550 from Japan was powered by a 553cc DOHC inline-4 producing 58hp at 9500rpm. Weighing 194.0kg (428 lbs) and with a seat height of 800mm, it was aimed at sportbike riders.
The 1964 Norton 650SS, hailing from United Kingdom, by contrast offered 646cc of OHV twin power, delivering 49hp at 6800rpm. Tipping the scales at 175.0kg (386 lbs) with a top speed of 185km/h (115 mph), it offered a distinct riding experience. 1980s motorcycles are the rising stars of the collector market. Early sportbikes and final-generation air-cooled models are gaining strong interest.
Specifications Comparison
| 1981 Kawasaki GPz550 | 1964 Norton 650SS | |
|---|---|---|
| Displacement | 553 cc | 646 cc |
| Power | 58 hp | 49 hp |
| Torque | 47.0 Nm | 52.0 Nm |
| Cylinders | 4 | 2 |
| Top Speed | 185 km/h | 185 km/h |
| Quarter Mile | — | — |
| Dry Weight | 194.0 kg | 175.0 kg |
| Wet Weight | 210.0 kg | 188.0 kg |
| Seat Height | 800 mm | 790 mm |
| Wheelbase | 1430 mm | 1400 mm |
| Fuel Capacity | 16.0 L | 14.0 L |
| Gears | 6 -speed | 4 -speed |
The Verdict
These two sportbikes are remarkably well-matched. With 58hp versus 49hp, the performance difference is marginal. The choice between them comes down to brand loyalty, aesthetics, and riding preference. For collectors, the 1964 Norton 650SS commands more attention with a 7/10 collectibility rating. Parts availability is good for the 1981 Kawasaki GPz550 and moderate for the 1964 Norton 650SS — an important factor for any restoration project.
About the 1981 Kawasaki GPz550
The 1981 1981 Kawasaki GPz550 is a 553cc four-cylinder sport bike that became one of Kawasaki's most memorable motorcycles of the 1980s.
Full 1981 Kawasaki GPz550 Profile →About the 1964 Norton 650SS
The 1964 1964 Norton 650SS is a 646cc twin-cylinder sport bike that became one of Norton's most memorable motorcycles of the 1960s.
Full 1964 Norton 650SS Profile →