Should I sell?

No. Thats the type mechanic you want working for you. Follows why I always recommend having your mechanic involved in all prebuys. ;)
A mechanic who suggests such an invasive, unproductive, and problem creating step as pulling a cylinder for an inspection vs a bore scope isn’t a mechanic I’d want working for anyone IMHO.
 
Exploratory removal of a cylinder brings risks. I can see it justified on a Lycoming if there is doubt about the condition of the camshaft, but it's not something to be taken lightly.
 
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A mechanic who suggests such an invasive, unproductive, and problem creating step as pulling a cylinder for an inspection vs a bore scope isn’t a mechanic I’d want working for anyone IMHO.
And this is the difference I pointed out to you in Post 34. Borescopes cant see everything on a recip. Full stop. Now if you requested a cylinder to be pulled from one of my customers aircraft I would recommend not to. However, if performing a prebuy for a customer and I thought there were internal issues with an engine I would definitely request a cylinder removal as a condition of sale. If not no sale. That is the type of knowledge I talking about in reference to aircraft ownership.
 
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