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I watched the video's, I read the thread, here are my notes,
(I think) The petcock is "off" in the video's, not reserve or on. ( OK for the vacuum test but not for a fuel flow test).
I did not hear any "compression events" while you were cranking the engine,are the spark plugs installed in the video's?
When you adjusted the intake valve,did you have the cam out to change a shim? or is there an adjuster? Cam timing may not be accurate if you had to remove the cam, resulting in no compression, no vacuum.
For the vacuum test during cranking, the throttle plates need to be "closed" as in "idle" not held open by the adjuster screwed in a bunch. Spark plugs installed, and a charged battery that will spin the motor.
For a "compression" test you hold the throttle open.
No need to crank more than three seconds for vacuum test result.
On the oil overfill, how much are you pouring in?
I remember my 250 was just a little more than one quart.
How much oil is draining out when you think it is overfull, two quarts?
Nuance matters.
HTH
Paul
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