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2013 250sx with oval bore jetting??

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Hey all,

I just bought a '13 KTM 250sx and noticed the carb has been 'oval bored' by cycle playgound to 36mm x 38mm.  My question is what effect does this have on jetting?  I pulled the carb and its setup as follows:

40 pilot

168 Main

NOZG needle

4th clip

Can I rely on the jetting chart in the manual or am i on my own now?  Just ran the bike this week at 4500 - 5500 feet and 80 - 90 degrees.  Bike seemed to run great but had trouble idling when warm and I noticed after an hour the plug seems majorly fouled (see photo)

Any advice would be greatly appreciated!  Thanks!

20170819_090827.jpg

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