best power gain for a 03 yz450f


6 replies to this topic
  • jturnbull329

Posted December 14, 2009 - 07:07 PM

#1

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

  • rjcook450

Posted December 14, 2009 - 07:15 PM

#2

Aftermarket pipe, and rejet.

  • xr88honda

Posted December 14, 2009 - 07:19 PM

#3

throw a big bore on the old girl

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  • mikedabike

Posted December 14, 2009 - 08:44 PM

#4

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

  • grayracer513

Posted December 14, 2009 - 08:57 PM

#5

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.

  • FinchFan194

Posted December 14, 2009 - 09:14 PM

#6

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.

  • jturnbull329

Posted December 15, 2009 - 03:28 AM

#7

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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