Trying to calibrate the SynchPro that I just purchased.
Trying to calibrate the SynchPro that I just purchased. All the resistors are in place and the vacuum screws backed out all the way. With my bike (Suzuki GS750) at 1,000 RPM idle, and no throttle chop, the liquid flew up the gauge. Most of the liquid is gone, and what stays in the gauge is way too high to calibrate. What can I do? I understand that the reservoirs need to be full, and they were when I set up the tool for calibration. I am not really interested in buying a refill kit to "restore" a brand new $100 tool that shot its wad the first time I go to calibrate it.\n\nWhat can I do here?
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I am sorry that you had a problem with your Syncpro. There are two ways that your problem could have occurred. One, the Syncpro was not filled completely. There should only be an approximately 1/4" air space between the top of the fluid and the calibration screws. If that was the case (as seems to be from your note) then your motorcycle is simply developing more intake vacuum than the tool is capable of. The limit of the tool is 40 cmHg, and many bikes like yours from that era develop a very high intake vacuum. This is due to inefficient pilot circuit design from that period in throttle slide carburetors, which the manufacturers compensated for by increasing intake vacuum to increase the pilot circuit signal.