[Mitchellclark02]

So I have a crf 250x with a crf 250r head and I’m not sure of everything else but as far as I know it is stock otherwise I have a low end bog I assume is the pilot jet I’m just not sure what size I would go with for my current setup let me know what you guys think?

[JimDirt]

Welcome to the site !!

Jetting is controlled by elevation and temperature , follow this chart from the manual and you should be in the ballpark , make sure to check the fuel screw setting as well , IF the bike has been sitting for a few months , it is possible the gas is bad ... so fresh Premium is a must when starting a rebuilt or freshened engine ... You did not mention the year , but the R and X are pretty similar in jetting , so this should get you where you need to be , then use the fuel screw to fine tune