I believe you have the same issue I had- float level is off, I'd try adjusting that first.Engine orientation must be different from the way it sat in the snowmobile changing the angle of the carb. Mine did exactly the same thing- on the jack ran perfect, me setting in it on the ground it just bogged down at 1/2 throttle. It should turn the wheels when on the stand as there isn't any load, simply apply the brake when on the jacks to see if it will still idle. If the brakes won't hold try idling it down some.
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