I had one like this. I smacked the top of the valve stem with a hammer and the retainer drove the guide back down. Straightened the push rod and put it back together. Ran great until I shut it off and started it up a week or so later. Same thing. So I did it again and got the same results.
The engine is now in my shop awaiting on a head change off a engine that had a broken rod.
Not a good idea to spend $225 on an old engine like that.
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