| A fuel tank that is too full could contribue to this phenomenon. It also sounds like the low needle is too rich.
 
 If the response is a 1-2 second delay,
 we're talking about a rich mixture overall.
 Are you hearing a "bubbling" sound when you give throttle?
 
 Please give more details (i.e. the conditions/situations where you're experiencing this)
 Say, engine temp, engine performance at idle, 1/4 throttle, 1/2 throttle, full throttle,
 engine feeback when you release the throttle etc)
 Is the clutch properly installed and engaging at the right time?
 Did you add/take off any head gaskets?
 Is the spark plug you're using suitable for your engine?
 
 For the time being,
 consider leaning the low needle by 1/4 turn,
 the same for high needle.  =)
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