# Service bulletin M1651

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: 11007548
- Published by NHTSA: 2024\-09\-09
- Manufacturer's number: M1651
- Manufacturer's date: 2024\-08\-22
- NHTSA component: POWER TRAIN; UNKNOWN OR OTHER; ENGINE

## NHTSA's summary

SERVICE BULLETIN M1651: 2023\-2024 CENTER\-COOLED REPLACEMENT CYLINDER HEADS. PURPOSE: This bulletin informs dealers that ignition coil mounting bracket bosses for all 2025 Center\-Cooled cylinder heads have been standardized. The mounting bosses will be machined to ⅜\-in. diameter for all production and replacement cylinder heads. Initial Release. 8/22/2024.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-11007548-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-11007548-9999.pdf)

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

## Components

Engine, Transmission and driveline

## Vehicles listed

- 2024 HARLEY\-DAVIDSON FLHX
- 2023 to 2024 HARLEY\-DAVIDSON FLHXSE
- 2024 HARLEY\-DAVIDSON FLTRX
- 2023 to 2024 HARLEY\-DAVIDSON FLTRXSE
- 2024 HARLEY\-DAVIDSON FLTRXSTSE

JSON: [/v1/bulletins/11007548](/v1/bulletins/11007548)

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