Continental O-200 on C150 M here
replaced cylinders
ran engine about 4 hours
oil keeps fouling up plugs
detonations when leaning mixture
bore scope shows oil squeezing out between cylinder walls and pistons
piston rings are correct according to mechanic.
Are you following the specified break-in procedure for your engine and cylinder type?
If you specify the cylinder type maybe someone will have advice for you. My only experience is with Lycoming O-360 and IO-360 nitrided cylinders which required more than 10 hours high power running with a rich mixture.
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