"Fuel cut" happens when you close the throttle anytime above
a preset rpm that is programmed into your bike's ECU, in other words
the injectors will stop during decel.... effectively turning the engine
off.... just the same as if you turned the igniton switch off.
Upon re-application of the throttle, there
is a time delay as your injectors start back up and the time it takes
to re-wet the intake tract, and combustion chamber. This can easily
bee seen in the videos as well.
The rider feels this as a delay and jerky response from closed throttle....
this is especially important while leaned over in a turn or trying to
re-apply the throttle from the closed position.
Fuel cut can also be heard and seen with an aftermarket
exhaust as a loud pop/bang/flame and jerk when the injectors come back
on as you re-apply the throttle from the closed position.... as can
be seen in the videos above.
Bikes with stock exhaust and/or catalyst still in place may not see
the or hear the flame/popping,
but the throttle feel and behavior will still be the same as in the
The reasoning behind shutting the fuel off on decel (basically turning
the engine off) is:
If the throttle is closed, then why keep the engine running?
The sole purpose of fuel cut is for reducing emissions.
When the fuel is turned off, engine braking and
throttle tip-in cannot be adjusted because the engine is not actually
running. To be running, an engine needs 3 things, fuel, air and ignition....
If you remove any of these 3 things, the engine isn't running. This
is why when the injectors stop, it's the same thing as if you turned
off the key, or the kill switch.
So, with stock ECU programming, or programming
that has not disabled fuel cut, you
are actually turning the fuel on and off with the throttle as you decel
and re-apply the throttle.... This can easily be heard and felt while
you are riding.
No amount of fuel adjustments, cable adjustments, or replacement throttle
tubes will solve the jerky throttle response that fuel cut causes....
They cannot because the engine isn't running during decel.
You can ALWAYS feel it when the injectors stop and restart every
time you close and re-apply the throttle when fuel cut is enabled.
I have included diasbling fuel cut for your bikes
in all my ECU programming that I offer to you.
As a result there is a very marked difference as to how much better
the entire bike responds and behaves under any riding condition....
This includes all aspects of handling and changing gears because the
bike doesn't pitch back and forth on it's suspension as the engine goes
from running... to off... and back on again...every time you manipulate
This just takes all the fun out of enjoying being leaned over in a corner
trying to re-apply the throttle without upsetting your line, or your
concentration while trying to manuver in traffic quickly, or your passenger
banging their helmet into yours when changing gears.
By us disabling fuel cut, your bike is
transformed into a perfectly smooth and predictable ride under any riding
condition, and the rider can pay more attention to where he/she is going
rather than how carerfully the unpredictable throttle is re-applied.
All models will benefit from no loud backfiring and jerky throttle upon
throttle re-application when this annoyance is disabled.
All FCE products are discontinued - No longer available
We now include this feature in all of our ECU