Across 4 covered model years from 2002 to 2006, the Harley-Davidson FLSTFI Fat Boy motorcycle has supplied wet/running weights ranging from 714.1 lb (323.9 kg) to 714.3 lb (324 kg) and dry weights ranging from 676.8 lb (307 kg) to 705.5 lb (320 kg), depending on model year.
Harley-Davidson FLSTFI Fat Boy weight overview
The scale number is high enough that parking and low-speed balance deserve real consideration. Once the bike leans too far, recovering it takes much more effort than on a light machine.
Very Heavy Motorcycle
How heavy is the Harley-Davidson FLSTFI Fat Boy?
wet weight
Using a model-level wet weight comparison, the Harley-Davidson FLSTFI Fat Boy is heavier than about 76.5% of 168 Harley-Davidson custom/cruiser motorcycles with compatible weight data.
Dry vs ready-to-ride weight
Bike + rider total weight
These totals use the model’s representative wet weight. They exclude riding gear, luggage and a passenger.
Harley-Davidson FLSTFI Fat Boy weight & related specs
| Model years covered | 2002, 2003, 2004, 2006 |
|---|---|
| Wet / running weight | 714.1 lb (323.9 kg) to 714.3 lb (324 kg) |
| Dry weight | 676.8 lb (307 kg) to 705.5 lb (320 kg) |
| Engine displacement | 1,442.2 cc to 1,449 cc |
| Power | 62.5 hp to 67 hp |
| Torque | 75.2 lb-ft (102 Nm) to 85 lb-ft (115.3 Nm) |
| Fuel capacity | 4.99 US gal (18.9 L) to 5.2 US gal (19.7 L) |
| Full-tank fuel weight (estimated) | 31 lb (14.1 kg) to 32.4 lb (14.7 kg) |
Weight changes by model year
The 2002 model is used as the baseline where data is available. Only later supplied values that differ are shown below. A year pill does not mean every individual weight field was supplied for that year.
Useful weight calculations
| Horsepower per 100 lb | 8.75 hp / 100 lb to 9.38 hp / 100 lb |
|---|---|
| Pounds per horsepower | 10.66 lb / hp to 11.43 lb / hp |
| Torque per 100 lb | 10.53 lb-ft / 100 lb to 11.91 lb-ft / 100 lb |
| Displacement per pound | 2.02 cc / lb to 2.05 cc / lb |
| Weight per 100 cc | 48.7 lb / 100 cc to 49.5 lb / 100 cc |
| Fuel weight as % of bike weight | 4.3% to 4.6% |
| Weight with full tank | 707.9 lb (321.1 kg) to 737.8 lb (334.7 kg) |
What the weight numbers tell you
Harley-Davidson FLSTFI Fat Boy weight FAQ
What is the Harley-Davidson FLSTFI Fat Boy dry and wet weight?
Across the covered 2002, 2003, 2004, 2006 years, listed wet/running weight is 714.1 lb (323.9 kg) to 714.3 lb (324 kg) and listed dry weight is 676.8 lb (307 kg) to 705.5 lb (320 kg). Check the year-change section because the exact figure can vary by model year.
Is the Harley-Davidson FLSTFI Fat Boy lighter or heavier than other Harley-Davidson custom/cruiser motorcycles?
Compared with similar Harley-Davidsons in this dataset, it is heavier than about 76.5% of 168 custom/cruiser motorcycles using the same weight basis.
Which Harley-Davidson FLSTFI Fat Boy years have different weight specs?
The supplied data shows different weight figures across the 2002, 2003, 2004, 2006 model years. Use the year-specific changes section above for the exact value attached to each changed year.
How much does a full tank add to the Harley-Davidson FLSTFI Fat Boy?
Based on the supplied 4.99 US gal (18.9 L) to 5.2 US gal (19.7 L) tank capacity, the gasoline itself weighs about 31 lb (14.1 kg) to 32.4 lb (14.7 kg) when full. This helps explain part of the difference between dry and ready-to-ride mass.
What is the combined Harley-Davidson FLSTFI Fat Boy and rider weight?
Using the model’s representative wet/running weight and a 180 lb rider, the combined bike-and-rider mass is about 894.2 lb (405.6 kg) before riding gear, luggage or a passenger.
What is the Harley-Davidson FLSTFI Fat Boy power-to-weight ratio?
Available model-year data produces 8.75 hp per 100 lb to 9.38 hp per 100 lb. It shows engine output relative to motorcycle mass rather than just quoting peak horsepower. That places it around the 32nd percentile within the compatible Harley-Davidson custom / cruiser power-to-weight comparison.
What does the Harley-Davidson FLSTFI Fat Boy weigh with a full tank?
The page calculates about 707.9 lb (321.1 kg) to 737.8 lb (334.7 kg) with a full tank by adding the listed fuel mass to the dry figure. Treat this as a practical estimate, not an official Harley-Davidson curb-weight number.
What is the Harley-Davidson FLSTFI Fat Boy torque-to-weight ratio?
Where compatible torque and weight figures are available, the model works out to 10.53 lb-ft per 100 lb to 11.91 lb-ft per 100 lb. This gives more context than torque alone because it relates engine twist to the mass it has to move.
How large is the Harley-Davidson FLSTFI Fat Boy engine for its weight?
The available figures work out to 2.02 cc per lb to 2.05 cc per lb. This is not a performance rating, but it is a useful way to compare engine size against total motorcycle mass.
Motorcycle specifications can vary by model year, market, equipment and the exact dry/curb-weight definition. Calculated fuel-weight and ratio figures on this page are estimates derived from the supplied specifications. Confirm critical figures in the owner’s manual or on the official Harley-Davidson website.