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Jerks, hesitates in higher RPM

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When i try to ride at a consistent speed at a higher rpm the bike will jerk and hesitate until i shift up. For example if I'm doing 35 in third gear (14-45). Ill try and ride that constant speed and the bike will jerk around, kinda like its not getting gas. I've done Dave's Mods and have a 52/160 jetting at around 850 feet elevation. Any ideas about how to fix this?

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It could be too rich.  I have a 158 main in mine and it's rich at sea level.  I would put a 155 in mine except that the richer mixture helps protect the higher compression piston that is in mine.  And mine runs really well at all engine speeds.

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