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KTM XC 250F W 2007 Stumble off idle

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I have a KTM XC 250F W that I just purchased for my son with 171 miles on it from a friend who just never had time to ride it (new 07 bike). Runs great except just of idle, rough and hesitates then runs fine through the rest of the RPM band? I put fresh 92 octane fuel in it and he has ridden it about 30 miles but it still has the hesitation. Does anyone have a suggestion what to do next. Tear down the carb and see if there is some trash in the carb? Richen it up?

Thanks

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My 08 450 XC-F was lean from the factory. I backed out the A/F screw 1 1/2 turns out and that solved my problem. I would try adjusting the A/F screw first before you buy the JD Jet Kit. On the other hand, my 09 525 XC had throttle lag and adjusting the A/F screw didn't help any, so I installed the jet kit. While installing the kit, I noticed that the accelerator pump wasn't squirting (FCR carb). A thorough cleaning solved the issue. The 525 XC was brand new off the showroom floor with a clogged accelerator pump. The 450 XC-F was brand new also, but it didn't have the FCR carb with accelerator pump.

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The 450 XC-F was brand new also, but it didn't have the FCR carb with accelerator pump.

That's odd, as all 250/400/450/520/525/530 4 stroke KTM's come stock with the FCR pumper carb.

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I am with Chas_M, never seen a KTM without a FCR pumper carb.....

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