AI Damage2005 Yamaha YP400: common problems
Owners of the 2005 Yamaha YP400 filed 6 complaints with NHTSA, most often about engine and cooling and electrical system. Details by component below, with sources.
Key figures
- Owner complaints
- 6
What fails most often
- 1 Engine and cooling 50% of all complaints
- 2 Electrical system 33% of all complaints
- 3 Engine 17% of all complaints
- Engine and cooling: 3 complaints (50% of all).
- Electrical system: 2 complaints (33% of all).
- Engine: 1 complaints (17% of all).
Symptoms owners describe
How many of the 6 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Engine and cooling | 3 | 0 | 0 |
| Electrical system | 2 | 0 | 0 |
| Engine | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
Once engine was warmed up, vehicle stalled at stoplights twice and once when starting to move after a stop (when in an intersection). Other times when stopped. Idle speed dropped below 1400, under which it stalls, and it was difficult to rev the engine to prevent stalling since there is no neutral gear, so revving…
It would on occasion stall. I had it twice stall while merging onto the freeway. This almost resulted in a crash, but I was able to get to the shoulder and restart the engine. The dealer replaced the ecu and I have not any problems since.
Vehicle stalls when attempting to accelerate normally (typically stalls in intersection). Not frequent. Vehicle restarts normally. Occurs when engine is fully warmed up.
2005 yamaha majesty 400cc scooter stalling in traffic. Engine was warm, coming to a stop. Engine stalled around 5-10mph. This is the 5th time since new. Condition very serious, as I was almost run over by traffic due to sudden loss of power/drive. This is a lawsuit for sure.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 13,278 of 36,656 model years in the NHTSA data (top 36% most complained about).
On average one model year of the YP400 has 3 complaints (5 years in the data). This year has 6, above average.
What to check before buying
- Engine and cooling. Radiator and fan after a frontal hit, coolant level and condition, overheating.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
Other years of this model
Questions and answers
What are the most common problems with the 2005 Yamaha YP400?
Owner complaints to NHTSA most often mention: engine and cooling, electrical system, engine. Total complaints: 6. The most frequent symptoms in complaint texts: stalls while driving (100%), loss of power / limp mode (17%).
How many service bulletins (TSB) were issued for the 2005 Yamaha YP400?
NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2005 Yamaha YP400 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2005 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-05.