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September 22, 2020 Service bulletin

Milwaukee-eight equipped vehicles - loss of power or high engine braking

Harley-Davidson technical service bulletin M1450 for 2017-2019 Harley-Davidson Flhtcu, 2017-2020 Harley-Davidson FLHX and 2017-2020 Harley-Davidson Flhtk and others.

Bulletin number
M1450
Component
Engine and engine cooling
Summary
SERVICE BULLETIN M1450: MILWAUKEE-EIGHT EQUIPPED VEHICLES - LOSS OF POWER OR HIGH ENGINE BRAKING. PURPOSE: Revision. 2017 - 2019 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.

Owners of these vehicles have filed 46 complaints in the engine category.

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