2018 Harley-Davidson FLHRXS Road King Special — 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 FLHRXS Road King Special.
Oil Sumping
HighOil accumulates in the crankcase rather than returning to the tank, causing power loss, overheating, and potential engine seizure.
Transmission Fluid Migration
MediumTransmission oil 'transfers' through the mainshaft into the primary case, overfilling the primary and starving the transmission.
Hydraulic Clutch Actuator Failure
HighThe internal seal of the clutch secondary actuator can leak, causing the clutch to lose pressure and fail to disengage.
Used Buying Inspection Checklist
What to look for when buying a used 2018 Harley-Davidson FLHRXS Road King Special.
Oil Pump / Sumping Check
Verify if the oil pump has been upgraded to the 2020+ version (Part #62400247) to prevent catastrophic 'sumping' failure.
Primary Vent Kit
Check for the presence of a vent tube on the inner primary (TSB M1492) which fixes transmission-to-primary fluid transfer.
Compensator Noise
Listen for a loud 'clunk' or 'bang' on startup or shutdown, which indicates a failing or weak compensator sprocket.
Hydraulic Clutch Recall
Check service records for the 2018 clutch actuator recall (Harley Recall 0173) to ensure the secondary actuator was replaced.
Your cart is empty