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I've seen injectors jam shut (killed a piston like that myself last year-Siemens Deka 60lbs) and it was only noticeable at idle. The engine would fool me with acoustics above 2500rpm. I went through the exercise of replacing the piston and test driving before I found it by reading the plugs compared to neighbor plugs. I think this may be quite likely here.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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