440/650 impeller?

[aytee]

Anyone have any suggestions as to which prop to stuff in this 440 i have that was converted to a 650? Mostly just a friend/bash ski put together with what i had sitting around... I'd rather just keep the 440 pump and reprop instead of switch to a 550 pump...

So what prop do i need? It's a stock 650.. no go fast stuff

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[Big Kahuna]

Hard to say, at least a 16 degree.