# Service bulletin M1727

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11032492
- Published by NHTSA: 2026\-05\-08
- Manufacturer's number: M1727
- Manufacturer's date: 2026\-04\-25
- NHTSA component: POWER TRAIN; UNKNOWN OR OTHER; ENGINE

## NHTSA's summary

SERVICE BULLETIN M1727: BIG TWIN INNER PRIMARY SEAL CHANGES. PURPOSE: Initial release. This bulletin informs dealers of changes to the Inner Primary Seal \(Part No. 12052\). The seal part number was changed from \(Part No. 12052A, black in color\) to \(Part No. 12052B, brown in color\). A new Inner Primary Seal \(Part No. 12052C\) has been released and the color has been changed back to black.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11032492-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11032492-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Engine, Transmission and driveline

## Vehicles listed

- 2015 to 2016 HARLEY\-DAVIDSON FLD
- 2015 to 2016 HARLEY\-DAVIDSON FLHP
- 2015 to 2016 HARLEY\-DAVIDSON FLHR
- 2015 to 2016 HARLEY\-DAVIDSON FLHRC
- 2015 to 2016 HARLEY\-DAVIDSON FLHTCU
- 2015 HARLEY\-DAVIDSON FLHTCU TC
- 2015 to 2016 HARLEY\-DAVIDSON FLHTCUL
- 2015 HARLEY\-DAVIDSON FLHTCUL TC
- 2015 to 2016 HARLEY\-DAVIDSON FLHTCUTG
- 2015 to 2016 HARLEY\-DAVIDSON FLHTK
- 2015 to 2016 HARLEY\-DAVIDSON FLHTKL
- 2015 to 2016 HARLEY\-DAVIDSON FLHTKSE
- 2015 to 2016 HARLEY\-DAVIDSON FLHTP
- 2015 to 2016 HARLEY\-DAVIDSON FLHX
- 2015 to 2016 HARLEY\-DAVIDSON FLHXS
- 2015 to 2016 HARLEY\-DAVIDSON FLHXSE
- 2015 to 2016 HARLEY\-DAVIDSON FLRT
- 2017 HARLEY\-DAVIDSON FLS
- 2015 to 2016 HARLEY\-DAVIDSON FLS103
- 2016 to 2017 HARLEY\-DAVIDSON FLSS
- 2015 to 2017 HARLEY\-DAVIDSON FLSTC
- 2016 to 2017 HARLEY\-DAVIDSON FLSTF
- 2015 HARLEY\-DAVIDSON FLSTF103
- 2015 to 2017 HARLEY\-DAVIDSON FLSTFB
- 2016 to 2017 HARLEY\-DAVIDSON FLSTFBS
- 2015 to 2017 HARLEY\-DAVIDSON FLSTN
- 2015 HARLEY\-DAVIDSON FLSTNSE
- 2016 HARLEY\-DAVIDSON FLTRU
- 2015 to 2016 HARLEY\-DAVIDSON FLTRUSE
- 2015 to 2016 HARLEY\-DAVIDSON FLTRX
- 2015 to 2016 HARLEY\-DAVIDSON FLTRXS
- 2015 to 2017 HARLEY\-DAVIDSON FXDB
- 2016 HARLEY\-DAVIDSON FXDBC 103
- 2016 to 2017 HARLEY\-DAVIDSON FXDBP 103
- 2015 to 2017 HARLEY\-DAVIDSON FXDF
- 2015 to 2017 HARLEY\-DAVIDSON FXDL
- 2016 to 2017 HARLEY\-DAVIDSON FXDLS
- 2016 to 2017 HARLEY\-DAVIDSON FXDWG
- 2015 to 2017 HARLEY\-DAVIDSON FXSB
- 2016 to 2017 HARLEY\-DAVIDSON FXSE

JSON: [/v1/bulletins/11032492](/v1/bulletins/11032492)

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