best power gain for a 03 yz450f

I have a 2003 yz450f and i was wondering what my best bang for my buck would be for a performance gain. Right now its all stock except for hot cams

Aftermarket pipe, and rejet.

throw a big bore on the old girl

Port the head. Done by someone who knows what they are doing will benefit more than a pipe or big bore.

Port the head. Done by someone who knows what they are doing will benefit more than a pipe or big bore.

Careful. Done by someone who doesn't know what he's doing it can cost you more than just money.

Is it down on power since you bought it? Maybe its times to split the cases for a new crank and then put a new piston in it.

no its got a tonn of power, and i dont think ive lost any but i just want more power. I think im gonna put a new topend in it this winter and maybe port it

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