2000 YF426F stumble

My yz426f seems to stumble when twisting on the power. Start up idles fine and seemed to be ok. Took it out and after a couple of seconds when I twist on the throttle seems to cough and splutter. Gets power and takes off and then dies, does not stall. Back off the throttle and it idles ok again. Any ideas guys new to the yz426. Coould it be timing or carby? Only thing I have done is change the chain and sprockets, had a hard time getting the front sprocket off, is it possible to jump the timing chain? Could it be electrical? Any help appreciated. Thanks

it is possible to jump the timing chain but i'm guessing its carb related. i'd try changing the clip settings up or down one on your jet needle.

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