Old school here. Take the air box off and put your hand on each throat while runnin`.
If you hear more rpm in one, there you go. Don`t do this for long, just to see if you can isolate to one throat. As Bushwacker said runnin` premix can be a double edged sword.
Have you done a compression test? That is always tops on my list.
Cheers,
Us.
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