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August 22, 2024 Service bulletin

2023-2024 center-cooled replacement cylinder heads

Harley-Davidson technical service bulletin M1651 for 2024 Harley-Davidson FLHX, 2024 Harley-Davidson Fltrx and 2023-2024 Harley-Davidson Flhxse and others.

Bulletin number
M1651
Component
Engine
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.

Owners of these vehicles have filed 4 complaints in the engine category.

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