I have got the newer mower back together. Put it on a nicer base.
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On first start up it ran flat out and I had to shut it down straight away.
Eventually worked out the governor arm and its shaft were not set right.
Also had to reshape the connecting rod as it was all bent.
There was no anti surge spring, so the older engine donated its.
I ran it with out the surge spring to see what it would do, the result was when changing speeds it would take a while to settle smoothly at that rpm. (it needs that spring)

Also had trouble getting it to idle, found the governor arm was hitting the breather pipe. So the butterfly in the carb would never close off. (I cable tied the pipe out of the way.

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The control rod and governor set up was a mess, when I get a new rod and spring I'm sure it will run nice, ATM it is surging a bit when mowing and takes a while to settle at a new speed.
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Idle screw was broken off and locked in , had a bit of a go at getting it out, I have left it for now.





Happy is he who penetrates the mystery of things.