Skip to content
EnginePart report

2008 Harley-Davidson Flhx Engine Problems

Complaints
4about this part
Share
13%of 30 total for the year
Median mileage
28,262miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 4 complaints about the engine of the 2008 Harley-Davidson Flhx, 13% of the 30 complaints for this model year. Where a mileage was given, the median is 28,262 miles.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“Riding my FLHX the other day and bike started making noise from my primary and I pulled over and checked noise and comfirmed it was coming from the left side(primary). Made it home safe; wasn't far from home. Took off the primary cover and checked over the inner primary components. The compensator and adjuster were bad. …”

NHTSA complaint #11022936, filed 2017-09, 25,000 miles

“While driving on a very busy highway at around 60 MPH I went to pass a car and while in the other lane passing I lost all throttle. This has happened numerous times and very dangerous. I have been riding motorcycles for 40+ years and can't even imagine what would happen to an inexperienced rider. I can not to this day get a straight answer from dealer's or mechanics. I guess this is all included in the $22,000 I dished out.very very dangerous. There are definite issues with the electronic throttle (fly by wire).”

NHTSA complaint #10512689, filed 2013-05, 30,000 miles

“I have actually 2 complaints regarding the engine I bought a 103 kit in my harley from the factory ... In the past year I've noticed some issues with starting on taking it into a mechanic I was told the issue was inherent with the 103 engine that was later addressed which they added compression release to the heads ... I am out of warranty so I went ahead with this from my mechanic ... However in doing so he had it apart and took a look at the compensator and primary bearing ... Both of which were bad ... I look on the forums and it appears to be an ongoing issue ... …”

NHTSA complaint #10701922, filed 2015-03, 26,523 miles

“While riding on the freeway at 65 MPH the check engine light came on and the bike went into a 'limp' mode all of a sudden and would not go over 15-20 MPH. Had to cut across traffic without getting hit to get to the side of the road. Turned off bike and it reset was able to make it home. Researched problem on line and have seems similar problems with this year and it's being traced bad pins used in some of the connectors during this time.”

NHTSA complaint #11361012, filed 2020-09, 31,000 miles

Related service bulletins

Engine: other model years

YearComplaintsShare of year
2018113%
2017120%
2013117%
201216%
201116%
2010417%
200927%
2008413%
200715%

Other parts of the 2008 Harley-Davidson Flhx

Brakes
9 complaints
Electrical system
6 complaints
Vehicle speed control
5 complaints
Fuel system
4 complaints
Transmission and drivetrain
4 complaints
Other or unknown
2 complaints
Wheels
2 complaints
Electronic stability control
1 complaints
Exterior lighting
1 complaints
Seats
1 complaints
Steering
1 complaints
Body and structure
1 complaints

← All problems reported for the 2008 Harley-Davidson Flhx

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology