Oil and filter change
≈ 8,000 km or 1 year
JASO MA or MA2 approved four-stroke motorcycle oil (JASO MB on scooters): an “energy conserving” car oil makes the wet clutch slip. Change it more often in city use or on track.
Source [1]Fat Boy (Twin Cam 103) · 2012–2017
Harley-Davidson Fat Boy (Twin Cam 103) 1690 · 75 hp (2012 to 2017)
The Harley-Davidson Fat Boy (Twin Cam 103) 1690 uses the Harley Twin Cam 103 petrol engine with 75 hp.
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Technical specifications
- Fuel
- Petrol
- Power
- 75 PS / 55 kW
- Displacement
- 1 690 cm³
- Cylinders
- 2
- Engine code
- Harley Twin Cam 103
- Period covered
- 2012–2017
- Documented market
- Europe
Transmission
- Manual · 6 speeds
Figures apply to the cited configuration and market; equipment and transmissions may vary by production date.
Specification source : [1] AutoKarnet
This version
75 hp (55 kW), belt final drive, 6-speed manual. Built from 2012 to 2017.
AutoKarnet advice
In the range
It is the only petrol version of this generation. The Harley Twin Cam 103 engine is also fitted to: Harley-Davidson Street Bob (Street Bob (Dyna)), Harley-Davidson Street Glide (Street Glide (Twin Cam)).
AutoKarnet advice
Body style and inspection points
On a motorcycle, tyres, final drive and brakes matter as much as the oil change. Check the tyre manufacturing date, steering-head play and fork-tube seals; an oil film on a tube means a fork seal needs replacing. A notched steering bearing can be felt when braking at low speed.
AutoKarnet advice
Comparing generations
Other documented generations of this model: • Fat Boy (Twin Cam 96) (2007–2011) : cruiser, 67–67 hp. • Fat Boy (2018) (from 2018) : cruiser, 87–94 hp. A first registration near a generation change does not identify the car on its own: check the body style and powertrain before using a service schedule.
AutoKarnet advice
Maintenance and records
≈: estimated reference — the vehicle’s service indicator prevails.
Brake fluid
Every 2 years
Replace the fluid in both circuits (and the hydraulic clutch if fitted), whatever the mileage; dark fluid has absorbed moisture.
Source [1]Fork oil
≈ 30,000 km
Fork oil change and seal check; an oil film on the tubes means a seal needs replacing before it contaminates the brake caliper.
Source [1]Final drive belt
≈ 16,000 km
Check the tension, cuts and teeth at each service; a trapped stone can cut it. No lubrication: the belt is cleaned with water.
Source [1]Spark plugs
Every 48,000 km
Replace the full set; worn plugs raise consumption and cause misfires.
Source [1]Air filter
Every 16,000 km
Replace more often in dusty conditions.
Source [1]Questions about this version (3)
Which engine is in the Harley-Davidson Fat Boy (Twin Cam 103) 1690?
The Harley Twin Cam 103 petrol engine (1 690 cc), 75 hp (55 kW).
AutoKarnet advice
Which oil for the Harley-Davidson Fat Boy 1690?
A JASO MA2 10W-40 four-stroke motorcycle oil suited to the Harley Twin Cam 103 engine.
AutoKarnet advice
How do I check this page matches my car?
This page covers Harley-Davidson Fat Boy (Twin Cam 103) 1690 75 hp, cruiser, 2012–2017, with 75 hp (55 kW), Harley Twin Cam 103, 1 690 cm³, 6-speed manual, 2012–2017. Compare these details with the registration document and gearbox identification. The designation Harley Twin Cam 103 may cover several revisions: a VIN is still needed to confirm part numbers.
AutoKarnet advice
Documentary sources
- [1] Rédaction AutoKarnet
AutoKarnet · FR · Europe · Synthèse éditoriale AutoKarnet · Accessed 09/10/2026