I have a stratocaster and next week Im going to get a JB humbucker pickup in but I was wondering whether to have 250k pots or 500k

Any help would be appreciated, thanks
It's a mix of both, I'm pretty sure. I'd check out Seymour Duncan's wiring diagrams for an HSS configuration. It will tell you which ones to use and where they go.
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it has 500k. i'd keep them. 500k isnt bad for singles and 250k is really warm for humbuckers. 250k will probably muddy the humbucker.

you should have asked this in the wiring thread.