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surging drz400s

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i have an 05 drz400s with 3x3airbox and k&n filter. installed dynojet kit with needle on 4th clip 140 main jet stock pilot. bike surges at steady throtle in mid to higher rpm most noticeable in 3rd 4th 5th gears. tried moving clip to 3rd 5th and 6th positions but didn't help. i am at sea level. any ideas ? thanks frak82

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You need a bigger main jet, try 142.5 first and put the needle back to where it was. Also, put in the 25 pilot, needed at sea level.:applause: vanram

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put in the 25 pilot and 142.5 main. noticed i may have had the needle stopper pushed down hard on needle. put needle back to 4th clip.surging is gone but so is the top end ; flattens out and wont pull. tried a run with air box cover and air filter out but was no help. put stock air filter instead of k&n and felt very slightly better.tried going back to 140 but was no help. i see many guys are using a 150 main. should i go in this direction or am i missing some other problem. thanks frak82

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