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White/Black MOTION PRO, INC. LOGO
Motion Pro, Inc.
867 American Street
San, Carlos, CA 94070
Tel: 650.594.9600 Fax: 650.594.9610
www.motionpro.com
INSTRUCTIONS
Motion Pro® 08-0411 SyncPRO™ Carb Tuner
Thank you for purchasing the Motion Pro SyncPRO™ Carb Tuner. This is a precision instrument and in order to insure that it is setup and used
properly please read all of the assembly and operation instructions before use.
Warning: All procedures should be performed by an experienced mechanic with proper tools and training. Failure to do so could result in
great bodily injury or death. Carburetor or throttle body synchronization should be done in accordance with the factory shop manual for your
vehicle. Follow all instructions and specications in your manual.
Assembly
1. Connect the hang hook to the SyncPRO™ and close the small
loop with a pair of channel locks to prevent it from inadvertently
coming off when in use (Image 1).
IMAGE 1
2. Cut the long piece of vacuum hose into four equal lengths.
Remove the vacuum caps on top of the clear tubes (Image 1) and
attach the vacuum hoses onto the clear tubes. If the vacuum hose
is difcult to install, moisten the end of the vacuum hose with a drop
of water and twist into place
Push the restrictor approximately 3/8” into the vacuum hose with
one of the barbs on the calibration manifold (Image 4 & 5).
IMAGE 4 IMAGE 5
The restrictors should now be located on the ends of the vacuum
hoses that will be connected to the intake manifold or carburetors.
3. Remove the rubber plugs from the bottom of the SyncPRO™
and store the manifold adapters in the body of the SyncPRO™
(Image 6).
IMAGE 2
Install a restrictor (Image 2) in the other end of each vacuum
hose. The tapered end of the restrictor should be inserted into the
vacuum hose rst (Image 3).
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IMAGE 3
IMAGE 6
4. Cover one of the six ports on the calibration manifold with a vacuum
cap. Then plug the calibration manifold into the short vacuum hose
and attach it to the side of the SyncPRO™ (Image 7).
IMAGE 7
Calibration and Use:
Calibration must be performed every time the SyncPRO™ is
used to achieve proper synchronization. Failure to calibrate
the tool at every use can result in the loss of uid.
Caution: Engine speeds exceeding 3,500 RPM, rapid throttle
closure and/or a vacuum of 40cm Hg (7.7 psi) or more can
cause the SyncPRO™ uid to be sucked into the engine.
6. Start the engine and run it at idle.
Caution: Engine speeds exceeding 3,500 RPM, rapid throttle
closure can cause the SyncPRO™ uid to be sucked into the
engine.
The SyncPRO™ has a vacuum limit of 40cm Hg (7.7 psi).
Exceeding this limit will result in the loss of uid from the tool.
Consult your service manual for manifold vacuum pressures
for your particular engine.
Follow all instructions and specications in your factory shop
manual. Carburetor or throttle body synchronization should
be done in accordance with the factory shop manual for your
vehicle.
Always use this tool in a well-ventilated area with plenty of fresh air.
Use an exhaust collector or ventilation fan to remove exhaust fumes
whenever possible. Utilize a fan to cool the engine when the engine
is running.
1. Always use the SyncPRO™ in an upright position. The handle
bar end is usually a convenient location.
2. Bring the engine to its normal operating temperature and then
shut it off.
3. Remove or raise the fuel tank. For non-fuel injected bikes you
can use Motion Pro’s Auxiliary Tank (P/N 08-0032) during
synchronization. For fuel injected models with external fuel pumps
you can use Motion Pro’s Deluxe Auxiliary Tank (P/N 08-0189).
4. Attach the short piece of vacuum hose with the calibration
manifold to the non-adjustable master carburetor or throttle body.
This is generally the carburetor or throttle body that the cables are
directly attached to. See your service manual for details. Then
attach all 4 vacuum hoses from the SyncPRO™ to the calibration
manifold (Image 8).
7. Calibrate the SyncPRO™ (make sure the uid levels of all four
channels are the same height) with the engine running by turning
the calibration screws on the SyncPRO™ clockwise to raise the
uid level and counterclockwise to lower the uid levels (Image 9).
Set the levels approximately 1/3 of the way up the scale if possible.
5. Before starting the engine turn all of the calibration screws
(Image 9) on the SyncPRO™ counterclockwise to completely
lower the uid levels. This will give you the maximum vacuum range
prior to starting the engine.
IMAGE 8
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IMAGE 9
8. Turn off the engine and remove the short piece of vacuum hose
with the calibration manifold and attach it to the side of the
SyncPRO™ for storage (Image 7).
9. Attach the vacuum hoses to each cylinder (vacuum hose No. 1
to cylinder No. 1, vacuum hose No. 2 to cylinder No. 2, etc.). If you
are synchronizing a twin, the two extra vacuum hoses can be left
unattached and do not need to be plugged. Use the vacuum port
adapters on models that require them. Most Honda and Suzuki
models use 5mm adapters, while most Yamaha models use 6mm
adapters. Some Kawasaki and Yamaha models have spigots
molded into the intake manifolds and do not require adapters.
10. Start the engine and bring it back up to its normal operating
temperature. With the engine at the proper idle, adjust the car-
buretor adjustment screws so that the SyncPRO™ uid columns
are approximately the same height. Once this is accomplished
you have completed your carburetor synchronization. Motion Pro
offers several tools for carb adjustments (P/N 08-0022, 08-0119,
08-0229). If synchronization cannot be achieved, other problems
may exist. Some possibilities are low compression, intake mani-
fold leaks, dirty air lters, worn out carburetor bodies, worn throttle
slides or possibly a restricted exhaust system.
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 disconnecting 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.
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 bodies. They do not represent specic vacuum values (i.e. cm Hg, in
Hg, psi, etc).
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 substantially 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.
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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 differential 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 models 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.
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