Primary drive gear play

Anybody else with an 03-05 yzf 450 have excessive side to side play with primary drive gear on crankshaft? Mine had what seemed like a lot of play so I threw an extra clutch thrust washer I had on the splined parts of the shaft(ended up being exact thickness of the play I had). I have to say my engine is a lot quieter now but was wondering if there is a reason for the play on that shaft? Gray?

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