All things have natural resonances including vibration isolators. Also isolators are designed for both vertical and horizontal loads. Lower frequencies generated with single cylinder engines usually present the greatest difficulty to isolate. I suggest that before you rush out and purchase new isolators that you get product specifications showing frequencies vs attenuation and loads, both vertical and horizontal from the isolator manufacturers and determine which can provide the best solution for you.
I am critical of isolators that allow height adjustments on a threaded shaft especially for horizontal forces. A better way to correct for height adjustments is to shim under the isolator.
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