combatpigg

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Thanks lfinney. That confirms what the guys at the local bearing supply shops have told me. They have looked at stock bearings from various model engines that I have brought in to them and shown me that those bearings aren't rated high enough to be in those engines at the rpm they run at.
I've had good results with Swiss made bearings with phenolic retainers and also building my own retainerless bearings with replacement balls and the original races.