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
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Engine, Transmission and driveline
| HARLEY-DAVIDSON FLHX | 2024 |
|---|---|
| HARLEY-DAVIDSON FLHXSE | 2023 to 2024 |
| HARLEY-DAVIDSON FLTRX | 2024 |
| HARLEY-DAVIDSON FLTRXSE | 2023 to 2024 |
| HARLEY-DAVIDSON FLTRXSTSE | 2024 |
Listing a model year does not mean every vehicle of it is concerned: the document says which.