Hello,
First from all, I hope that the unit is not defective. We are testing each one individually prior to shipping to make sure that there is no fault. Usually this is the last thing that could be wrong from our experience. The problem is usually in the configuration. But if you want to be absolutely sure and you have another unit, you can just try the unit where it is working well with the same settings. I guess that the result will be same.
Technically. If you can see RPM reading and throttle servo is moving, then there is nothing in the unit that could be wrong. There are just two conditions - it works or not at all.
Vibration level does not play any role regarding the governor.
The main reason, why you can observe something like this is usually only in the Throttle Range configuration, RPM sensor reading or needle settings. If you can see stable RPM readings also when RPM is high and low, then I believe it is just Throttle Range/Needle settings. In any way, we can check your unit if you wish, since whatever can happen. But checking with your other unit can save you money and time.
Approximately for 60% problems of the governor throttle range is responsible.
Also, when the mixture is poor, then it is normal, that even with flat throttle curve and Gov Off, the head speed can shoot to the maximum. And even with TC it can take a while to drop down. This is happening when motor is too strong/load is very small. E.g. in hovering, pitch pumping.
So first I recommend is to set more rich mixture.
Then I recommend to verify, that Throttle Range - Max. is configured so that it is really just at the fully opened carburator, but not more. Or for the testing, set there even lower value. So that carburator is opened e.g. at 95%.
On the other hand, Min. value should be configured so that it is exactly at 0%, but not less. Some carburators allows to go over the limits, so that there are dead zones - this is bad for governor, because it does not see any change even that servo is moving.
_________________ Spirit System developer
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