2021 Harley-Davidson FLHX Street Glide — 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 2021 Harley-Davidson FLHX Street Glide.
Stiff / Inconsistent Cable Clutch
MediumOwners report the 2021 cable clutch feels heavier than the previous hydraulic system and requires frequent adjustment.
Plastic Clutch Adjuster Failure
HighThe inline self-adjuster is made of plastic and can fail, causing the clutch to lose all tension.
Aftermarket Tuner Compatibility
MediumA change in the ECM data port for 2021 made many existing tuners (like older Vance & Hines FP3) incompatible without new hardware.
Finding Neutral
LowDifficulty finding neutral is common when the primary chain is out of adjustment or the clutch cable has too much slack.
Used Buying Inspection Checklist
What to look for when buying a used 2021 Harley-Davidson FLHX Street Glide.
Clutch Engagement Point
If the clutch engages right at the grip or at the very end, it indicates poor adjustment or a failing plastic adjuster.
Diagnostic Port Type
Verify if the bike has the 6-pin Euro 5 red diagnostic port, which requires specific adapters for older tuners.
Infotainment Screen
Check for flickering or 'ghost touching' on the screen, which can indicate moisture ingress or wiring harness issues.
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