1999 WR400 rear shock spring

Im wanting to swap rear shocks from a WR400 to a YZ250 and im wanting to know the difference in springs. I know the stock YZ is 4.9 KG, just not sure what the WR is. Reason for changing, is because the YZ shock feels completely blown out and i have this WR400 parts bike just sitting around. BTW im trying to get rid of the WR if anybody would be interested.

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