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My drz400 Sputtering at high rpms

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Hey, sorry if im starting a thread on something already talked about but i cant find my specific problem. My bike starts "decent" when cold once even alittle warm tho its almost impossible to get started again. On top of that anything above 3/4 it pops and sputters like crazy seems to get worse as the bike fully warms up. I thought it was a carb issue so me and my buddy my shop mechanic and all around bike guy did a jd jet kit with a 3x3 mod. Cleaned the fuel valve, gas tank and changed the spark plug. Still same problem. If anybody has any ideas or suggestions on this i would greatly appreciate any feed back because its got me and my friend scratching our heads.

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It only happens in the higher rpms anthing above 3/4 throttle. I changed the plug not the cap and wire i'll try that. And the jet kit rules out the main jet plus from what i could see the carb was spotless inside.

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