Two Brothers Racing Yamaha YFZ450 Dyna FS Ignition - Manual (Page 2)

Calibration (continued)
Using the other curves may result in a lean misfire condition at high RPMs when the jetting is not properly set. Do not
operate the engine in a lean condition for extended periods or damage may result.
This ignition will allow the engine to rev to a higher RPM than what it has before. The rev limit is programmable from
2000rpm to 16,000rpm, in 100rpm increments. Stock rev limit is 10,750rpm. The revlimit is pre-programmed to 11,500.
Because the rev limit is higher and can now be easily increased further, the performance limits of other engine parts
(valvetrain for example) may be found. It may be necessary to replace these parts for best engine performance. Consult
with an engine builder for answers on what works best for your engine.
Programmable ignitions
Lap-top/PC Programmable versions (suffixed with a P in the part number) require a separate programming kit to reprogram
them. It is not supplied with the ignition. If the programmable ignition was not purchased directly from Dynatek, the dealer
may have programmed a custom set of ignition curves. The dealer should be consulted with any questions regarding the
curves that are programmed into the ignition.
Programmable ignitions are shipped with additional leads coming out of the ignition. These leads allow the ignition to
control other features. To program these features, follow the instructions in the programming kit.
PURPLE – Programmable launch limiter. Ground this wire to activate
GREEN – Tachometer output, for a standard 12v, two pulse per rev aftermarket tach.
BLUE – Optional 2-amp switch to ground, referenced as “RPM Switch 1” in PC Software.
WHITE – Optional 2-amp switch to ground, referenced as “RPM Switch 2” in PC Software.
The Launch RPM is programmable and can be wired to the stock clutch switch (Black/Yellow wire), or to a separate clutch
switch (not included) for a “two step/low side” launch limiter. See attached wiring diagram for installation.
The launch limiter has a one-time only activation. If the ignition detects the purple wire is grounded, then the ignition will
not rev past the low-side limit. When the low-side rpm limit is detected, and the purple wire becomes ungrounded, then the
launch limiter is defeated and will not work again until the power is cycled off and back on.
The White & Blue 2-amp switches can be used to activate a solenoid or relay. Connect the relay with hot +12v wired to
one side of the relay coil, and the other side connected to White or Blue. When the rpm activates the switch, it will be
grounded inside the ignition box, causing current to flow through the relay coil. DO NOT connect any device which
requires more than 2 Amps (Amps=Volts/Resistance). See attached wiring diagram for wiring the relay.
Troubleshooting
Troubleshooting the Dyna ignition is simple. If the bike will not start or run at all, reinstall the stock ignition. If this fixes
the problem, then the Dyna ignition should be returned to Dynatek for testing. If this does not fix the problem, then the
problem is somewhere else on the bike. Follow the troubleshooting procedures outlined in your bike shop manual.
If the bike runs, but poorly, put the stock ignition back on the bike. If this fixes the problem, reinstall the Dyna ignition. If
you are using non stock ignition coil, spark plug, or stator, replace them with OEM units. Then follow the procedures in the
calibration section to set the Dyna ignition up to work with your bike. If calibration doesn't fix the problem, the ignition
should be returned for testing. If the problem persists when using the stock ignition then the problem is external to the Dyna
ignition.