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2003 DR-Z400S Stutter??

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I picked up an 03 DR-Z400S with only 100 miles on it. It has been sitting for a few years so I'm expecting that it needs a carb clean???

If I give it a ton of gas in each gear it stutters/hesitates. If I gradually give it gas in each gear (but what is the fun in that) it does not stutter or hesitate. I've put 50 miles on it since I got it and I thought it would clean itself out.. but it is still doing the stutter..

Any suggestions?

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If it has been sitting for a while I would clean the carb (jets), drain the gas tank put in fresh fuel, try a new spark plug. Also would consider changing the oil too and check all the other fluid levels.

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jetting, mine did this when I first got it brand new from the stealer because it was jetted for 3,500 feet below my elavation

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If it has factory jetting, it is WAY lean for Colorado. They're too lean for Death Valley to meet emissions.

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