puch e50 primary drive bearings

Tony Destefano /
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I'm in the process of gathering parts to rebuild an e50 engine. The engine will end up with a polini kit so I want to make sure everything is in top shape.

Should I worry about the bearings on the primary drive? Do they ever really need to be replaced?

For the crankshaft, should I have a shop press on the bearings or have people had good luck with the freezing the crank, heating the bearings method?

Thanks for the help.

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