2020 Harley-Davidson Road King (FLHR) — 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 2020 Harley-Davidson Road King (FLHR).
Brake Light Software Recall
MediumA recall affected 2020-2022 models where the brake light could stay illuminated regardless of rider input. Fixed via a software update.
Fluid Transfer
MediumTransmission fluid migrating into the primary case. While largely addressed by 2020 with a factory vent, some owners still report migration on high-mileage bikes.
Plastic Intake Manifold
LowThe stock intake manifold is plastic and can warp or leak over time, leading to a lean condition or erratic idle.
Used Buying Inspection Checklist
What to look for when buying a used 2020 Harley-Davidson Road King (FLHR).
Primary Vent Kit
Check if the primary vent tube has been installed to prevent 'fluid transfer' from the transmission to the primary, a known issue on early M8 touring bikes.
RDRS Functionality
If the bike is equipped with the optional RDRS, ensure no warning lights persist after moving 3-5 mph, as sensor failures can be expensive to repair.
Service History (1k Service)
The 1,000-mile service is critical for M8 engines to check for sumping and to change all three fluids after break-in.
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