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YZ 290 porting

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Well I just ordered a 290 kit for my 2010 YZ 250f. I know that it will loose some top end but I was wondering if porting the head a little bit would liven up the top end? As the bike is now without the 290 it has amazing top end and revs really fast. I am assuming the revs will get slowed down a little bit and the power will shift to the bottom end?

Thanks for any info

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Yes thats correct, to really get the advantage of the 290kit you will need to get your head ported and carb bored to get back the full power spread feel.

Jesse at Williamsmotowerx.net did my 290cc motor, and it's simply amazing.

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The 290 pistons are usually the same weight, or even lighter so revving isn't really affected from what I hear.

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Jesse does everything, he's a full fledged professional motorbuilder. You will have to talk to him about pricing, I don't remember what I paid for each service.

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