User Manual
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11. Disconnect the synchronizer, remove the vacuum hose
adapters (if applicable) and replace any plugs, caps or hoses
that were removed. Reinstall the fuel tank.
Caution: Engine and exhaust systems can get very hot.
Care should be taken when connecting and discon-
necting fuel lines to prevent gas from spilling onto hot
engine and exhaust components.
Tips:
•To check the intake manifolds for air leaks, run the engine
at idle and spray a ne mist of water on the manifolds. Any
drop in idle speed indicates an intake manifold air leak.
•Troubleshooting guides are also available in manuals from
Clymer Publications for your specic model.
Storage:
•Store in an upright or horizontal position at or above 32º F
(0º C).
FAQs:
Q: Does the SyncPRO™ need to be calibrated before
each use?
A: Yes, as opposed to a Mercury manometer the SyncPro™
has four separate channels and literally four separate scales,
meaning that after calibration if the vacuum is increased sub-
stantially the readings on each channel will differ. Because
vacuum changes during synchronization at xed RPM’s
don’t vary much, this error is insignicant when the tool is
calibrated at approximately the same vacuum that the tool
will be exposed to during synchronization. This is why it is
required that the tool be calibrated on one of the cylinders it
will be used on prior to starting the synchronization process.
Q: How do I prevent the SyncPRO™ uid from being
sucked into the engine?
A: Before every calibration turn all of the calibration screws
on the SyncPRO™ counterclockwise (Image 9). This will
give you the maximum vacuum range prior to starting the
engine. Also, prevent engine speeds from exceeding 3,500
RPM, avoid rapid throttle closure and/or a vacuum level
greater than 40cm Hg (7.7 psi).
Q: Will the uid harm my motor if it gets sucked inside?
A: No, due to the nature and quantity of uid it will not cause
any harm.
Q: Can the SyncPRO™ uid be replaced?
A: Replacement SyncPRO™ uid is available by ordering
Motion Pro P/N 08-0581 SyncPRO™ Fluid Rell.
Q: Gaps have formed in the SyncPRO™ uid columns.
What can I do to correct this?
A: Turn all of the calibration screws on the SyncPRO™
clockwise (Image 9) until they are bottomed out. This will
move the uid level up into the clear tubes as far as possible
without a vacuum. Now hold the SyncPRO™ near the hang
hook and give it a good shake downward like a thermometer.
That should condense the uid column again. Make sure
to turn the calibration screws back out prior to calibrating
the SyncPRO™ again. If this process does not improve the
separation, check the chambers in the bottom of the tool.
The chambers should be nearly full of uid. If the uid level is
low, air has been pulled into the tubes, and the tool will need
to be relled.
Q: Why is the uid column oscillating so much?
A: Check to make sure the restrictors are installed in the ends of
the vacuum hoses. If a restrictor is missing or located near the
SyncPRO™ end of the vacuum hose it will cause excessive uid
oscillation.
Q: One or more uid columns are not responsive.
A: This can be caused by a blocked restrictor. Remove the
restrictor from the vacuum hose and use carburetor cleaner and
compressed air to clean the small orice. You should be able to
see through the restrictor if you hold it up to a light source.
Q: What do the lines on the scale represent?
A: They are reference lines only, used to facilitate in calibrating
the SyncPRO™ and synchronizing the carburetors/throttle bod-
ies. They do not represent specic vacuum values (i.e. cm Hg, in
Hg, psi, etc).
Q: Will the synchronizer work on outboard motors and
snowmobiles?
A: Yes, it will work on most multi cylinder engines provided the
vacuum does not exceed 40cm Hg (7.7 psi).
Q: Do I need to synchronize my fuel injected engine?
A: Virtually all four stroke fuel injected applications with multiple
throttle bodies require synchronization. Check your service
manual to verify this.
Q: My shop manual gives a specic value or range that the
vacuum should be at. Do I adjust the carbs to this value?
A: While some manufacturers specify a value (height of mercury
Hg, psi, etc.) for the vacuum at idle, with very few exceptions, the
purpose of synchronization is to adjust all intake tracts to equal
values in order to achieve a smooth idle. The exception to equal
vacuum values at idle occurs when the intake tracts are not of
equal length and the manufacturer has specied a specic differ-
ential between cylinders to account for the difference in the intake
tracts. If this is the case a vacuum gauge set or a digital vacuum
synchronizer is recommended.
Q: Is the SyncPro uid toxic?
A: SyncPro uid is a proprietary blend of petroleum-based
minerals oils.
Eyes: It is not expected to cause prolonged or signicant eye
irritation. Skin: Contact with the skin is not expected to cause
prolonged or signicant irritation. Not expected to be harmful to
internal organs if absorbed through the skin. Contact with the skin
is not expected to cause an allergic skin response.
Ingestion: Not expected to be harmful if swallowed.
Inhalation: Not expected to be harmful if inhaled. Contains a
petroleum-based mineral oil. May cause respiratory irritation
or other pulmonary effects following prolonged or repeated
inhalation of oil mist at airborne levels above the recommended
mineral oil mist exposure limit. Symptoms of respiratory irritation
may include coughing and difculty breathing.
Q: Does the SyncPRO™ come with vacuum adapters to t
my vehicle?
A: It comes with 5mm adapters which t most Honda and Suzuki
models. Optional 6mm short and long adapters (P/N 08-0168
and 08-0040) are available separately, and most Kawasaki mod-
els don’t require adapters.
Q: Can the SyncPRO™ uid be used in place of mercury in
the earlier style mercury manometers?
A: No, the SyncPRO™ uid will not work in place of mercury,
or vice-versa. While the SyncPRO™ and older mercury units
look similar, they are functionally different, and will not work with
alternate manometer uids.