Gravely 260Z - Rpm's bog down when moving under load

[Turbodriven]

So do this cylinder canceling out test and report back with the findings..

The test results of this are in post #32 and a follow up in post #46 in the Kohler thread I linked to above.
There is also a video of it starting at idling (low and high), and of it running and dropping rpms in post #31