The 1970 Harley-Davidson XR750 from United States was powered by a 748cc OHV V-twin producing 90hp at 8000rpm. Weighing 145.0kg (320 lbs) and with a seat height of 700mm, it was aimed at racing riders.
The 1979 Harley-Davidson FXEF Fat Bob by contrast offered 1207cc of OHV V-twin Shovelhead power, delivering 62hp at 5200rpm. Tipping the scales at 262.0kg (578 lbs) with a top speed of 155km/h (96 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
| 1970 Harley-Davidson XR750 | 1979 Harley-Davidson FXEF Fat Bob | |
|---|---|---|
| Displacement | 748 cc | 1207 cc |
| Power | 90 hp | 62 hp |
| Torque | 72.0 Nm | 92.0 Nm |
| Cylinders | 2 | 2 |
| Top Speed | 210 km/h | 155 km/h |
| Quarter Mile | — | — |
| Dry Weight | 145.0 kg | 262.0 kg |
| Wet Weight | 158.0 kg | 282.0 kg |
| Seat Height | 700 mm | 700 mm |
| Wheelbase | 1380 mm | 1530 mm |
| Fuel Capacity | 10.0 L | 18.0 L |
| Gears | 4 -speed | 4 -speed |
The Verdict
Comparing these two Harley-Davidson machines reveals the brand's evolution. The 1970 Harley-Davidson XR750 laid the groundwork with 90hp, while the later 1979 Harley-Davidson FXEF Fat Bob pushed output to 62hp. From a collector's perspective, the 1970 Harley-Davidson XR750 holds the edge with a 9/10 rating. Either way, both are worthy additions to any Harley-Davidson collection. Parts availability is very difficult for the 1970 Harley-Davidson XR750 and good for the 1979 Harley-Davidson FXEF Fat Bob — an important factor for any restoration project.
About the 1970 Harley-Davidson XR750
Born in 1970, the 1970 Harley-Davidson XR750 is a 748cc twin-cylinder racing machine producing 90hp from Harley-Davidson.
Full 1970 Harley-Davidson XR750 Profile →About the 1979 Harley-Davidson FXEF Fat Bob
Born in 1979, the 1979 Harley-Davidson FXEF Fat Bob is a 1207cc twin-cylinder cruiser producing 62hp from Harley-Davidson.
Full 1979 Harley-Davidson FXEF Fat Bob Profile →