04 Yamaha Majesty 400 discussion forum:

RE: Cutting out

RE: Cutting out

Bob said 2005-06-26 05:18

Re my inquiry for the same problem...can be found at news:alt.scooter news:alt.motorcycles.yamaha too:

"R_LaCasse" (vampire@istar.ca) wrote in message
news:etmpb1907japgvk1lpfo9091sf02dn93fp@4ax.com...
)
) I had 2 engine cut-outs for no reason known to me or the Majesty yp400t
) system readings, in traffic today, at 27deg.C and I thought it might be
) due to
) something concerning the following Yamy Majesty yp400ts specs:
)
) |Suction piston-type throttle body fuel injection provides crisp, clean
) throttle response with excellent fuel economy and reduced exhaust
) emissions. The system also features a throttle position sensor (T.P.S.)
) that provides information to the ECU to provide the most accurate ignition
) timing possible for maximum performance at all rpms. Special idle speed
) control means there is no need to adjust the idle. a special motor
) regulates idle speed.
)
) |The F.I. system uses a single fuel injector with 12 spray holes for
) excellent fuel atomization and more complete combustion. The injector is
) located downstream of the throttle body in the intake manifold.
)
) Although It may simply be that the Carb/Fuel Injectors need cleaning. I
) have done this before and it ran for 400KMs and I guess I will need a
) thimble
) full again.
)
) Since I only have 550KMs on the Majesty´s break-in period, it seems odd
) that the jets clog up so quickly in normal driving conditions....
)
) Since I´m not too experienced, in Fuel injections, I was wondering if
) this is a regular issue, nevertheless, I will try the additive Gum-out
) stuff for
) fuel injector cleaning since this occurring at idle speeds, and it seems
) like I
) am getting more miles per gallon than I should...
)
) ThanX
)
) Bob
)
Forget the injector unless you are burning crude oil.

Does the bike have a "check engine" light on the instrument pod? If so,
there may be onboard diagnostics in the system. A service manual (always a
real plus with an injected bike) will show you how to check each sensor, but
I suspect the TPS, especially if the bike stalled when you returned to idle
speed. I had a similar problem with my ´04 FZ6. Check to see if a
re-designed TPS is available from Yamaha. It should be a free fix.

Bob

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