NHTSA service bulletin

NHTSA Service Bulletin 10115149: Harley-davidson Harley Davidson

Official manufacturer communication context for model years not specified Harley-davidson Harley Davidson, with affected products, buyer checks and links into Carchieve recall, problem and VIN research.

NHTSA service bulletin 10115149 summary graphic for model years not specified Harley-davidson Harley Davidson
10115149NHTSA document ID
Technical service bulletincommunication type
1affected product rows
75/100quality score

Reviewed June 2026 from NHTSA manufacturer communication and service bulletin records. Carchieve is independent and not affiliated with any vehicle manufacturer or government agency.

Quick answer

SERVICE BULLETIN M1450: LOSS OF POWER ON 2017 MILWAUKEE-EIGHT EQUIPPED WITH SCREAMIN' EAGLE STAGE III OR IV KITS. [REVISION] 2017 model motorcycles equipped with a Milwaukee-Eight? engine and a Stage III or Stage IV kit can experience a condition known as Sumping during extended periods in low gear, at high rpm or under heavy engine load. Sumping is when an excessive amount of oil is suspended in the engine crankcase and the flywheel must travel through the oil, resulting in loss of power and potential engine component damage with extended use under these conditions. This bulletin provides the diagnostic procedure for determining if sumping is occurring. This information applies to all MY2017 Touring, CVO, Trike and Touring Police model motorcycles with a Milwaukee-Eight engine and a Stage III or Stage IV kit installed.

What this bulletin may mean before buying

Treat this as service research, not a verdict on one car. Before you buy, compare this communication with official recall campaigns, model-level owner complaint patterns, and the exact vehicle’s VIN-decoded specifications. A bulletin can help you ask a seller or dealer sharper questions about software updates, known repairs, warranty extensions and service history.

Affected products listed in this communication

MakeModelModel yearsBuyer note
Harley-davidsonHarley Davidsonmodel years not specifiedAsk for service records and run the exact VIN before purchase.

Buyer checklist

  1. Run the 17-character VIN and confirm the year, make, model, engine and equipment match the listing.
  2. Check recall campaign pages for safety actions that may require dealer repair.
  3. Compare this bulletin with common problem pages for the same model and component area.
  4. Ask the seller or dealer whether the bulletin procedure, update or inspection has already been completed.
  5. Use the used-car buying checklist and get an independent inspection.

Frequently asked questions

What is NHTSA service bulletin 10115149?

SERVICE BULLETIN M1450: LOSS OF POWER ON 2017 MILWAUKEE-EIGHT EQUIPPED WITH SCREAMIN' EAGLE STAGE III OR IV KITS. [REVISION] 2017 model motorcycles equipped with a Milwaukee-Eight? engine and a Stage III or Stage IV kit can experience a condition known as Sumping during extended periods in low gear, at high rpm or under heavy engine load. Sumping is when an excessive amount of oil is suspended in the engine.

Is a service bulletin the same as a recall?

No. A recall is a safety campaign with a required remedy for affected VINs. A service bulletin or manufacturer communication usually describes diagnostic, repair, software, warranty or service information.

How should a used-car buyer use this bulletin?

Use it as a research signal. Compare it with recalls, owner complaints, service records, a VIN report and an independent inspection before buying.

Check the exact VIN before you buy

Model-level pages show public safety patterns. A full VIN report helps confirm the exact vehicle, decoded specs, recall applicability and buyer checks.

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