RayTechAutomotive
SynchroKing 4 Mk2 - Instruction Manual
www.raytechautomotive.com 5 of 6 Rev 3
Aug 2022
Operation
The following paragraphs describe the generic synchronization procedure which will be applicable
to most vehicles. The user should read these in conjunction with the vehicle's service manual.
Some manufacturers specify specific vacuum levels.
1. Find the test port plugs in the inlet manifold test ports and remove them.
2. Select the correct size of nipple (either M5 or M6) and install them into the manifold's test
ports. Apply 'snub tight' torque only, enough to compress the O-rings. Some vehicles are
fitted with vacuum test port that accept the 5mm hose to be connected directly; if this is
the case the nipples are unnecessary.
3. Push the hoses onto nipples, take note which manifold connects to which port on the
SynchroKing 4S Mk2
4. Connect the alligator clamps to the vehicle's battery. The device will now come on-line
and execute to automatic calibration. - CAUTION: Observe correct polarity and take care
not to cause a short circuit.
5. The display should now light up and indicate "- - -" on all displays.
6. Start the vehicle and allow the engine to warm up to normal operating temperature.
7. With the throttle fully closed, adjust, as necessary, the stationary adjuster screw on the
carburettor or throttle valve body, until the bar displays equal vacuum in both inlet
manifolds. (See Figure 3).
8. The dampening factor may be used to reduce the 'bounce' on the display that the engine
may produce. Bear in mind that increasing dampening will reduce bounce but reduces
sensitivity and vice versa.Most engines will not achieve a perfect and stable readout, the
user should aim for the best practically achievable setting.
9. After the idle balancing has been completed, proceed by slowly opening the throttle and
allow the engine speed to increase to roughly 1/3 of maximum RPM. Repeat the
procedure above for idling only using the balancing adjuster screw(s) - refer to the
manual.
10. Re-check and re-adjust the idle and balancing screws as required and stop the engine.
11. Remove the hoses.
12. Allow the nipples to cool of and remove them from the manifolds.
13. Reinstall the test port plugs (do not forget any seals or gaskets, observe the instructions
in the workshop manual).
