2017 Harley-Davidson FLHRXS Road King Special — Maintenance & Ownership Guide
Routine Maintenance
Key maintenance tasks to keep your 2017 Harley-Davidson FLHRXS Road King Special running reliably.
Engine Oil
Requires ~4.5 to 5.0 quarts of 20W-50; critical to monitor due to early M8 sumping risks.
Primary & Transmission Fluid
Primary takes ~30-34 oz; Transmission takes ~32 oz. Use Formula+ or equivalent.
Spark Plugs
Uses 4 plugs (2 per cylinder), model RG6HCC. Gap should be ~0.031 inches.
Common Wear Items
Parts that wear over time on the 2017 Harley-Davidson FLHRXS Road King Special and should be inspected regularly.
Brake Pads
Linked ABS system can lead to faster rear pad wear if the rider relies heavily on the front brake.
Tires
The 19-inch front tire is a specific profile (130/60B19) that may have fewer options than standard 17-inch sizes.
Popular Upgrades
The most popular aftermarket upgrades for the 2017 Harley-Davidson FLHRXS Road King Special.
Stage 1 Performance
Exhaust, high-flow air cleaner, and a tuner (like SE Pro Street) are standard first steps to unlock power.
Suspension
While improved over previous years, many owners upgrade to Legend or Ohlins for better long-distance comfort.
Used Buying Inspection Checklist
What to look for when buying a used 2017 Harley-Davidson FLHRXS Road King Special.
Oil Cooler Line Clamps
Check for evidence of the 2017 recall fix (NHTSA 17V333) to prevent sudden oil loss onto the rear tire.
Secondary Clutch Actuator
Verify the 2018 recall (NHTSA 18V734) was performed; faulty units leak fluid internally, preventing clutch disengagement.
Oil Sumping Signs
Look for oil in the air cleaner or blue smoke on startup; early M8 oil pumps (2017-2019) were prone to failure.
Transmission Fluid Level
Check for 'fluid transfer' where transmission oil migrates into the primary case due to a pressure differential.
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