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Does the physical movement of the tiller grip throttle change as you change from Forward to reverse? The motor has a mechanical linkage under the carburetor that should be physically restricting the amount of throttle travel when in Neutral and Reverse. Of course there should be no limitation when in Forward.
Those engines do have an odd shift linkage design. Unlike others…..moving the lever forward (down) gets Reverse and moving the lever back (up) gets Forward. That part is normal.
The other thing that I would look at; if there is no physical limitation of throttle opening in Forward is whether you could be running on one cylinder.