Not quite flat spot, but a "no pull" situation at 1/16 to 1/4 throttle at 30mph on up

fyrman41

Typical gear head
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Middle Granville, New York
My bike runs great but seems to have a point when theres no acceration at all when throttle is cracked at 30 mph on up. Seems more of a problem when fully warmed. Im only 180 ibs so my weight shouldnt be the problem. Doesnt really matter what gear im in most noticable in 4th and 5th. There no stumble or pop just no power at all. Once you get past that point of throttle where you hear the deep groan of the intake suction. Theres no hesitation when blipping the throttle not really even when its cold, nor any deseleration popping. The plugs look fine left cylinder plug is light tan on the side and right cylinder is darker tan on one side. Needles are dropped 1 notch and i played with the floats setting them to 25mm like it said for 79 bs38s. Timing and valves checked just fine. Any ideas?
 
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