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Engine bogging...

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I have a 97 XR600 that runs great, except when you try to quickly accelerate from an idle. If you are at idle and crank open the throttle, it will try to bog to a complete stall. If the RPM's are up a little, the engine runs spectacular and throttle response is crisp.

Is this a main jet problem? Am I running too rich? Will tweaking the air screw help fix this problem?

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Tweaking the air screw may help. However, xr's are notorious for this misfortune. Every xr I have ever slung a leg over does this. Only thing to do is get the carb tuned perfect, and learn to deal with it. Or, go get a pumper carb.

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Does the 600 have the same carb as the 650L or does that year still have the dual carbs? What mods have you done to the carb you have. I followed the advise of a friend about drilling the slide and shimming the needle, on my 94 650L, and got rid of my off idle throttle bog completely.

Ray

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