When I rebuilt my '06 EC300 last winter the stock impeller was nearly completely eroded away at 90 hours.
I run the LTR impellers in both of my GasGas 300's. They are top notch.
Also check you water pump seal, as I have had 5 of them fail over the years.
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Eric K
'06 GasGas EC300
'01 GasGas XC300
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