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Wr250f big bore

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I've been trying to get more bottom end power for my 2002 wr250f it doesn't have much low end power I'm just wondering if a 290 big bore will add more power down low but still keep the top end power it has.

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For the most part yes.  I didn't notice any loss in top end power, but I started with a ported head and stock cam.  Unless you like to hold the throttle wide open and bounce off the rev limiter on straight a ways, I think it's a good mod.  You'll notice a lot more low end power.  Make sure your clutch is in good shape.

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Before I'd spend $$ on a big bore, have you regeared and rejetted? There's much to be gained by getting those right and far less expensive.

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Also, changing the cam timing tl yzf specs yielded great results. The bike ran like a yz with heavy flywheel and wide ratio gears.

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