Posted by P and R Pete on October 11, 2012 at 14:17:01 from (173.86.14.68):
One last chore before I get my FIL"s 450 back to him...
The throttle has no response until it"s moved fully a third on its 90-degree arc. The only adjustable piece is in the second link of the four pieces that deliver throttle motion to the "speed-change lever" of the governor. Lengthening this piece by its unthreading moves the governor-speed-lever closer to engaging (with the throttle kept all the way on "idle"), which has resulted in some improvement, but I"m at the practical limit of its "unthreading" with some ways to go to get more immediate response from the throttle.
I see nothing within the governor that is adjustable, though my I&T manual suggests checking "synchronizing the governor-to-carburetor" linkage within the connecting rod housing.
All the link-ends are rods with the ends bent 90 degrees going through holes in the links, and held in place by cotter pins, which may lead to a bit of slop also, and maybe some delay-in-throttle-response is pretty normal. I can live with that. but I"d like to know if I"m missing something, because I"d worry that a delay in response means I"m not getting close to the top-RPM capability of the engine.
Any thoughts?
Second, I was going to check his valve adjustment before calling it a "wrap". I have an IH sheet that shows a "simplified valve adjusting procedure" in which all 8 valves can be adjusted with only two movements of the crank, at #1 TDC and at #4 TDC. Help me with a reality check- is not #4 TDC exactly 1 and 1/2 revolutions of the crank?
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