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wr450 jetting

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hi everyone, its bloody cold here in england, ive put a white bros exhaust on my wr450 { 2005} performance filter and was wondering what size to increase the main jet to, ive removed the old one and it has a 165 in it ,,, any suggestions, thanks regards paul:thumbsup:

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if its any cosellation i just had to go from a 165 to a 178 on my wr 250f by the way for putting on a stock yz 250f pipe. So id bet that you would probably have to go to at least a 180 but i would call the dealer and see what they have to say about it first

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I would check your service manual at the back of the manual in the tuning

section and maybe go to the next size up it might take a few times to get

to the right size main jet for the pipe. And while your at it step up your pilot

jet to. Main jet for upper rpm range and pilot jet for lower rpm range to full

rpm range.

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