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2000 XR250R with unknown big bore kit.... Carb problems

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Well here it is, I've been searching over and over again with no luck. 


I have as stated a 2000 XR250R with all of "Gord's mods" done plus an unknown big bore kit. (can't find paperwork) From memory it's a 300cc and from the power it once had it was all good. After re-jeting as per the mods everything was all good but as of late it will only run well with choke halfway position. Fully open its bogs and closed it stalls.... Help please!! going to pull it off the bike again and tear it down just in case I've missed something. Going to get a new rebuild kit just the same. Any suggestions. 



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