Yamaha YP400 stalling problems

Filed Jul 16, 2014 · Fuel system · 4,000 miles · WA

In hot weather, the yamaha yp400 fails to start, stalls at idle, and intermittently cuts fuel at high speed. Symptoms are nonexistent until the air temperature exceeds about 95 degrees f. Similar problems with the fuel pumps are frequently documented with owners of majesty yp400 models as well as t-max xp500 and zuma yw125, the last of which was subject to a recall of its own.

Filed Dec 18, 2013 · Engine · 9,600 miles · SC

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 more than slightly can make the vehicle move.

Filed Jun 23, 2011 · Fuel system · 2,360 miles · IN

This is a 400cc motor scooter being ridden during an 85 degree day. The vehicle engine stalled after entering a busy intersection and could not be restarted. After pushing the vehicle out of the intersection, attempts to restart for over an hour failed and the vehicle was trailered home. This scenario was ( hot temperature stall and failed restart) was repeated at my residence on three different occasions. The vehicle was taken to the yamaha dealership, diagnosed with a fuel pump assembly failure, and confirmed repair upon pump replacement. It can be calculated for approximate pump life to be 80 to 120 hours of operation (average 20 to 30 MPH) for the limited 2360 miles accumulated. This is not an acceptable component life for a fuel injection vehicle and indicative of a manufacturing quality problem that could result in potentially fatal accident should pump failure occur in a busy intersection. I inquired about whether this pump failure could be customer induced and was told they were unaware that it was possible to cause this in-fuel tank pump to be abused by customers.

Filed Apr 26, 2010 · Electrical · 4,500 miles · HI

Engine stalling while moving.

Filed Aug 31, 2009 · Engine, Fuel system · 2,451 miles · PA

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. The consumer traded the scooter. Updated 12/31/09.

Filed Jun 3, 2009 · Fuel system · 600 miles · PA

Tl*the contact owns a 2006 yamaha yp400 motorcycle. The vehicle was repaired according to the federal safety agency 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 and the manufacturer stated that they were unsure if the harness was replaced at the time of the recall repair. The dealer would have to notify the contact once the vehicle was re-inspected. The failure mileage was 600 and current mileage was 25,000. Updated 07/24/09.

Filed Jun 9, 2008 · Electrical · 480 miles · IL

Scooter stalls and is hard to start again. Just purchased the scooter less than 60 days ago and it is unreliable as we have been stuck twice in one day.

Filed May 8, 2008 · Engine · 14,450 miles · CA

Engine stalls in traffic.

Filed Apr 10, 2008 · Electrical · 320 miles · WA

I had a new 2005 majesty (yamaha) scooter. 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.

Filed Apr 7, 2008 · Engine · 3,000 miles · AR

Vehicle stalls when attempting to accelerate normally (typically stalls in intersection). Not frequent. Vehicle restarts normally. Occurs when engine is fully warmed up.