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Frequently
Asked Questions
About Ignition modules
Q: Can you give me more advance curve information's ?
Q: What is V.O.E.S. ?
Q: How do I know if I have single fire or dual fire ?
Q: How do I wire for Dual Fire ?
Q: How do I wire for single fire ?
Q: How do I time the engine ?
Q: When I turn the Ignition switch on a GREEN light turns
on and when I run the motor cycle it works ok but the light turns
yellow. I've never seen a yellow light before. What am I doing wrong
?
Q: While the engine is running I tried to change the RPM
limit switch or advance curve switch. After I changed them it seems
like there is no effect. What am I doing wrong ?
Q: When installing a nose cone Module, Do I leave the stock
module in place ?
About Voltage Regulators
Q: What is the difference between Series Voltage regulator
and O.E. style shunt ?
Q: How can I check the regulator ?
About Tach Adaptor
Q:
How do I wire the tach adaptor ?
About Ignition modules
Q: Can you give me more
advance curve information's ?
A: Sure, Basic advance curve information is available by
clicking here
.
Q: What is V.O.E.S. ?
A: First of all the V.O.E.S. is a Vacuum Operated Electric Switch
and is a vacuum advance, not a retard unit. it is designed to advance
the ignition timing when the engine is not under load. All dressers
should advance at 5.5'' to 6.0" of manifold vacuum. Softtails,
Dyna Glides around 3.5'' to 4.5''. Sportsters should advance at
3.0''. On all motors if the compression is increased or a performance
cam is installed set V.O.E.S. at 5.5''.
The Compu-fire system
has two V.O.E.S. settings. 50% is 5 degrees of advance and 100%
is 10 degrees of advance. No matter which one you choose the timing
will not go over the designated figure for a particular module.
Again, if the module is programmed for 32 degrees at no time during
any RPM range will the combined mechanical and vacuum advance go
over 32 degrees.
This type of system is designed
for economy however we have noticed a couple more ft. lbs. of
torque when using V.O.E.S. The additional advance keeps the combustion
chamber a little cleaner (leaner) and under acceleration the cylinder
does not load up (richer) allowing more cylinder heat. The bikes
will also run smoother on the low end with V.O.E.S.
The V.O.E.S. can be
adjusted by using a vacuum pump and an ohmmeter. An adjustment screw
is located under the sealed area. Use an exacto knife to remove
the sealer. Use the procedure in the Harley manual to test and adjust
with a screwdriver as necessary. Use white or black silicone to
seal.
Q: How do I know if I have single fire or dual fire ?
A: Single fire requires a coil for each cylinder. Dual fire
requires only one coil for both cylinders.
Q: How do I wire for Dual Fire ?
A: The RED wire
goes to the positive side of the coil , BLACK wire goes to the negative
side of the coil , the GREEN wire goes to the VOES if used, White
wire is not used and MUST be taped off.
Q: How do I wire for single fire ?
A: The RED wire goes to the positive side of both coils , BLACK
wire goes to the front coil , The GREEN wire goes to the VOES if
used, The white wire goes to the rear coil.
Q: How do I time the engine ?
A: Front cylinder must be TDC on compression. The RED wire from
the module is connected to the positive side of the battery. Turn
the module all the way to the LEFT ( retard ), Make sure the LED
is out and slowly move the module to the right until LED comes on
.
Q: When I turn the Ignition switch on a GREEN light turns
on and when I run the motor cycle it works ok but the light turns
yellow. I've never seen a yellow light before. What am I doing wrong
?
A: On startup when you see a GREEN light that means your
VOES switch is faulty (shorted to ground ). It should have ( Open
) no connection to ground. The solution is to replace or ( repair
) the VOES switch. On startup when the VOES switch is shorted to
ground and the engine is running you should see a YELLOW light blinking
instead of RED. This is a reminder for you to repair the VOES switch
.
Q: While the engine is running I tried to change the RPM
limit switch or advance curve switch. After I changed them it seems
like there is no effect. What am I doing wrong ?
A: The module will read switches once on startup and will
memorize the settings. The purpose of this is to prevent problems
caused by vibration . After each switch change you should turn the
ignition off and back on.
Q: When installing a nose cone Module, Do I leave the stock
module in place ?
A: Yes you may but unplug it from the wiring harness.
About Voltage Regulators
Q: What is the difference between Series Voltage regulator
and O.E. style shunt ?
A: When there is no demand on the battery the voltage is
shunted directly to the ground on the O.E. style. In the Series
style the voltage regulator turns the charging system off. Therefore
there is no magnetic field between the stator and rotor reducing
engine load and heat build up.
Q: How can I check the regulator ?
A: Follow test procedures in any Harley-Davidson's service
manual. Be sure you use a test light and not a digital volt meter.
You can open the same page on line by click here If you can't open
it then you need to download Acrobat reader from our web site by
clicking here.
About Tach Adaptor
Q: How do I wire the tach adaptor ?
A: The tach adaptor has only three wires. The black wire goes
to the front cylinder coil, the white wire goes to the rear cylinder
coil and the red wire goes to the tach unit.
The
words Harley-Davidson®, Big Twin, Evolution, Softail, FXR and
Sportster™ are registered trademarks of Harley-Davidson®,
Inc, Milwaukee, WI Copyright © 1997
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