2018 Harley-Davidson FLHTKSE CVO Limited — 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 FLHTKSE CVO Limited.
Oil Sumping
HighOil accumulates in the crankcase instead of returning to the tank, causing power loss, extreme heat, and engine failure.
Transmission Fluid Transfer
HighTransmission oil migrates through the mainshaft into the primary case, leaving the transmission dangerously low.
Elusive Neutral
LowDifficulty finding neutral when stopped, often exacerbated by the hydraulic clutch or primary overfilling from fluid transfer.
Used Buying Inspection Checklist
What to look for when buying a used 2018 Harley-Davidson FLHTKSE CVO Limited.
Oil Pump Revision
Verify if the oil pump was upgraded to the 2020+ version to mitigate catastrophic 'sumping' risk (TSB M1450).
Primary Vent Kit
Check the back of the inner primary for a vent tube; its absence suggests the bike may still suffer from fluid transfer.
Cold Start Smoke
Blue smoke on startup is a primary indicator of oil sumping or valve seal issues common in early M8 engines.
Transmission Fluid Level
A low transmission dipstick with no visible external leaks usually confirms the fluid transfer issue.
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