Nice rare view of a leaky needle or needle jet. I have a heavily used Suzuki DRZ70 that looks to have needle jet wear. I’m trying to diagnose a bog at about 40% throttle.

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hey, best is to change needle and needle jet in once. Now you are getting too rich idle, and low end. I tried to lower needle (one notch up) it helps on low end, but have troubles on middle power, i tied to play with pilot screw adjustment, then you have problems with idle (i have 4 cyl. so each cyl gets different amount of fuel , because needle jets are worn different). dont know what bike it is, if its one cyl. you can play with needle and pilot screw, and i think you can have some optimal solution. For 4 cyl. bike it doesnt work.. Good luck with it. p.s. one more good thing buy afr meeter, cheap one lets say digital display and bosch lsu 4.9 wide band sensor, then you see what is going on, overwise youre blind