That doesn't mean a lot when it comes to the suspension linkage being properly lubricated - Yamaha didn't supply grease as standard equipment!

Did you check and re-grease it when you fitted the shock?

A dry top bush can cause irritating sqeaks - try a squirt of teflon spray like GT80 and see if it stops.

IMHO It is unlikely to be the shock itself (and if it is send it back!)

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