# Service bulletin 1HD\-X3H4B\-12

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: 10125153
- Published by NHTSA: 2017\-12\-14
- Manufacturer's number: 1HD\-X3H4B\-12
- Manufacturer's date: 2017\-11\-15
- NHTSA component: POWER TRAIN; ENGINE

## NHTSA's summary

SERVICE BULLETIN M1450: MILWAUKEE\-EIGHT EQUIPPED VEHICLES \- LOSS OF POWER OR HIGH ENGINE BRAKING. Purpose: 2017 and 2018 model motorcycles equipped with a Milwaukee\-Eight engine can experience a condition known as sumping during extended periods at high rpm or under heavy engine load. This bulletin provides the diagnostic procedure for determining if sumping is occurring.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2017/MC-10125153-9999.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2017/MC-10125153-0001.pdf)

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

## Components

Engine, Transmission and driveline

## Vehicles listed

- 2017 to 2018 HARLEY\-DAVIDSON FLHP
- 2017 to 2018 HARLEY\-DAVIDSON FLHR
- 2017 to 2018 HARLEY\-DAVIDSON FLHTCU
- 2017 to 2018 HARLEY\-DAVIDSON FLHTCUL
- 2017 to 2018 HARLEY\-DAVIDSON FLHTCUTG
- 2017 to 2018 HARLEY\-DAVIDSON FLHTK
- 2017 to 2018 HARLEY\-DAVIDSON FLHTKL
- 2017 to 2018 HARLEY\-DAVIDSON FLHTKSE
- 2017 to 2018 HARLEY\-DAVIDSON FLHTP
- 2017 to 2018 HARLEY\-DAVIDSON FLHX
- 2017 to 2018 HARLEY\-DAVIDSON FLHXS
- 2017 to 2018 HARLEY\-DAVIDSON FLHXSE
- 2017 to 2018 HARLEY\-DAVIDSON FLRT
- 2018 HARLEY\-DAVIDSON FLSL
- 2018 HARLEY\-DAVIDSON FLSTB
- 2017 HARLEY\-DAVIDSON FLSTF
- 2017 HARLEY\-DAVIDSON FLSTN
- 2017 to 2018 HARLEY\-DAVIDSON FLTRUSE
- 2017 to 2018 HARLEY\-DAVIDSON FLTRX
- 2017 to 2018 HARLEY\-DAVIDSON FLTRXS

JSON: [/v1/bulletins/10125153](/v1/bulletins/10125153)

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