Yamaha YP400 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
13 owner complaints analyzed
2 distinct recall campaigns
4,000 mi median reported failure mileage
Scope: 2005 to 2012 model years. Data snapshot: . 13 complaints include usable failure mileage.
This selection has limited data. It remains available for lookup but is excluded from search indexing.
Most common problems
Electrical System is the most frequently named component, appearing in 3 of 13 complaints (23.1%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Engine operation | 11 | 84.6% |
| Fuel system concerns | 4 | 30.8% |
| Braking behavior | 1 | 7.7% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Electrical System | 3 |
| Engine And Engine Cooling | 2 |
| Engine And Engine Cooling:Engine | 2 |
| Fuel System, Gasoline | 2 |
| Fuel/Propulsion System | 2 |
| Electrical System:Software | 1 |
| Engine | 1 |
| Fuel System, Gasoline:Delivery:Fuel Pump | 1 |
Electrical System: 3; Engine And Engine Cooling: 2; Engine And Engine Cooling:Engine: 2; Fuel System, Gasoline: 2; Fuel/Propulsion System: 2; Electrical System:Software: 1; Engine: 1; Fuel System, Gasoline:Delivery:Fuel Pump: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 13 |
| 25,000 to 49,999 | 0 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 0 |
Under 25,000: 13; 25,000 to 49,999: 0; 50,000 to 74,999: 0; 75,000 to 99,999: 0; 100,000 to 149,999: 0; 150,000 and above: 0
Under 25,000 miles has the most reports with usable mileage (13). 0 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2007 | 1 |
| 2008 | 4 |
| 2009 | 2 |
| 2010 | 1 |
| 2011 | 1 |
| 2013 | 1 |
| 2014 | 2 |
| 2018 | 1 |
2007: 1; 2008: 4; 2009: 2; 2010: 1; 2011: 1; 2013: 1; 2014: 2; 2018: 1
Pattern summary
Electrical System leads the component reports. Engine operation appears in 11 complaint narratives. Fuel system concerns appears in 4 complaint narratives. Braking behavior appears in 1 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 10201010 · 2007-08-28 (August 28, 2007)
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. ON A VERY SMALL YAMAHA SCOOTER FORUM, THERE ARE ALREADY 38 OTHER RIDERS WITH THIS EXACT SAME SCOOTER THAT HAS STALLED AT LEAST ONCE. HTTP://MAJESTYUSA.COM/FORUMS/VIEWTOPIC.PHP?T=486&POSTDAYS=0&POSTORDER=ASC&START=0. THIS IS A VERY SERIOUS COMPLAINT I'M FILING. I AL…
Owner-reported narrative. 12,100 miles reported. Look up ODI 10201010 at NHTSA ↗
Owner report 10223529 · 2008-04-07 (April 7, 2008)
VEHICLE STALLS WHEN ATTEMPTING TO ACCELERATE NORMALLY (TYPICALLY STALLS IN INTERSECTION). NOT FREQUENT. VEHICLE RESTARTS NORMALLY. OCCURS WHEN ENGINE IS FULLY WARMED UP. *TR
Owner-reported narrative. 3,000 miles reported. Look up ODI 10223529 at NHTSA ↗
Owner report 10272788 · 2009-06-03 (June 3, 2009)
TL*THE CONTACT OWNS A 2006 YAMAHA YP400 MOTORCYCLE. THE VEHICLE WAS REPAIRED ACCORDING TO NHTSA CAMPAIGN ID NUMBER 08V180000 (FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP); HOWEVER, IT CONTINUES TO STALL AND SHUT OFF. THE CONTACT FEELS THAT THE ACTUAL HARNESS WAS NOT REPLACED ACCORDING TO THE REMEDY, AND WAS ONLY INSPECTED AT THE TIME OF THE REPAIR. THE MANUFACTURER INFORMED HIM TO TAKE THE VEHICLE BACK TO THE DEALER FOR FURTHER INSPECTION SINCE THE VEHICLE WAS ORIGINALLY REPAIRED UNDER RECALL. THE CONTACT INQUIRED ABOUT REPLACING THE HARNESS A…
Owner-reported narrative. 600 miles reported. Look up ODI 10272788 at NHTSA ↗
Owner report 10282435 · 2009-08-31 (August 31, 2009)
TL*THE CONTACT OWNS A 2006 YAMAHA YP400V. THE CONTACT STATED THAT WHILE DRIVING 10 MPH, THE SCOOTER STALLED WITHOUT ANY PRIOR WARNINGS. AS A CONSEQUENCE HIS RISK FOR SERIOUS INJURY AND CRASH WERE INCREASED. THE SCOOTER WAS TAKEN TO A DEALERSHIP IN WHICH A TECHNICIAN CONCLUDED THAT THE FUEL INJECTOR WAS THE CAUSE OF THE FAILURE. THE FAILURES HAVE NOT BEEN REMEDIED AS OF CURRENT DATE THEREFORE THE SAFETY RISK IS PRESENT. THE CURRENT AND FAILURE MILEAGES WERE 2451. UPDATED 12/30/09 *BF THE DEALER CLEANED THE ELECTRIC FUEL PUMP CONNECTORS. T…
Owner-reported narrative. 2,451 miles reported. Look up ODI 10282435 at NHTSA ↗
Owner report 10614652 · 2014-07-18 (July 18, 2014)
ACCELERATING FROM STOP INTO A LEFT TURN AT AN INTERSECTION THE ENGINE JUST DIED AND WE ALMOST FELL BECAUSE A BUMP AND BRAKE LIKE EVENT OCCURRED WITH THE BIKE LEANING OVER FOR THE TURN, THIS WAS VERY UNSETTLING. SIMILAR EVENTS HAD OCCURRED PREVIOUSLY AFTER STARTING TO ACCELERATE FROM A STOP OR A NEAR STOP. THEY HAD OCCURRED WHEN DRIVING IN A STRAIGHT LINE AND THE ENGINE RESTARTING RIGHT UP AFTER EACH INCIDENT. THIS LAST TIME IT OCCURRED WITH THE BIKE LEANING, WITH A LITTLE HIGHER MOMENTUM BECAUSE OF A HIGHER SPEED AND IT HAPPENED AT THE WORST PL…
Owner-reported narrative. 19,950 miles reported. Look up ODI 10614652 at NHTSA ↗
Recalls by model year
All campaigns in the snapshot affecting each model year, including recalls announced years later.
Recall campaigns
Shared campaigns appear once in each affected model year.
| Category | Count |
|---|---|
| 2005 | 2 |
| 2006 | 2 |
| 2007 | 2 |
| 2008 | 0 |
| 2012 | 0 |
2005: 2; 2006: 2; 2007: 2; 2008: 0; 2012: 0