2018 Harley-Davidson FLHR Road King — Common Issues & Known Problems
Known Issues & Owner Reports
These are the most commonly reported issues and concerns from owners, mechanics, and community forums for the 2018 Harley-Davidson FLHR Road King.
Oil Sumping
HighOil accumulates in the crankcase instead of returning to the tank, causing power loss, overheating, and potential engine failure.
Fluid Transfer (Transmission to Primary)
MediumTransmission oil migrates into the primary case due to a vacuum effect, leaving the transmission dangerously low.
Clutch Actuator Leak
HighThe secondary clutch actuator can leak fluid internally, causing the clutch to lose pressure and fail to disengage.
Inaccurate Fuel Gauge
LowThe fuel light often comes on with 2+ gallons remaining, or the needle drops prematurely.
Used Buying Inspection Checklist
What to look for when buying a used 2018 Harley-Davidson FLHR Road King.
Transmission Oil Level
Check if the transmission fluid is low and the primary is overfilled; this indicates the common oil migration issue.
Air Cleaner Housing
Look for oil residue inside the air cleaner; excessive oil here is a symptom of sumping or breather issues.
Front Brake Pulse
Test ride to check for front brake lever pulsation, which confirms warped rotors.
Clutch Recall Status
Verify that the secondary clutch actuator (recall #0173) has been replaced by a dealer.
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