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DRZ 400S Low speed miss

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Hello,

My 2003 DRZ400S is driving me crazy. It will have a low speed miss,approx 33-35 mph. At low speeds it jerks. I checked the valve clearance, pulled the carb off last week and thoroughly cleaned it. I moved my air screw out to approx 4 turns. Now it seems that it doesn't back pop as much when I come off the throttle, but still has that hesitation! It is still factory jetting on my carb. I would think that it shouldn't miss,even with factory jetting? Only thing I have done,was put the billet tip on the muffler.Any suggestions?

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How is it at idle? My idle is a little rough since I went back to a stock plug. I guess I will have to go back with the hotter plug. You only notice the hesitation a certain speeds? or certain RPMs?

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I notice it mainly at low speeds. It will stall once in a while on my way to work. Doesn't seem to stall on the way home though. It idles ok, once in a while a miss. It isn't smooth in 2nd or 3rd gear at approx 25ish mph. I can't figure it out, but I am quite sure it shouldn't be that way. My other bikes are smooth.

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Have you carried out the air box mod too much??It done the same on mine but reduced the area involved an now its ok,just seems as if it was getting "too much " air through,im running standard carb with a remus slencer system

hope this helps :thumbsup:

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I haven't done the air box mod. It is still stock, except for the billet tip.

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