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Service bulletin M1527

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10195016
Published by NHTSA2021-06-04
Manufacturer's numberM1527
Manufacturer's date2021-05-07
NHTSA componentENGINE AND ENGINE COOLING; POWER TRAIN

NHTSA's summary

SERVICE BULLETIN M1527: REVOLUTION MAX LEAK DETECTION. PURPOSE: To inform dealers of the potential to misdiagnose leaks on the Revolution® Max engine.

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

Vehicles listed
HARLEY-DAVIDSON RA12502021
HARLEY-DAVIDSON RA1250S2021

Listing a model year does not mean every vehicle of it is concerned: the document says which.