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#7
08-21-2017, 09:25 AM
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dunno Yamaha but...my zuki 4 stroke had similar problem when you back off.
It was the IAC (Idle Air Control valve). Problem was random for a while but eventually I got an error code on the Tachometer. There was an adjustment which I did and it helped for a while but then I ended up replacing the IAC valve.
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1984 V20 "Express" & 2003 Suzuki DF140 (SOLD!) 2000 GradyWhite 265 Express YouTube/SkunkBoat https://www.youtube.com/channel/UC4F...znGospVOD6EJuw Transom Rebuild https://www.youtube.com/watch?v=EEz94NbKCh0 https://www.youtube.com/watch?v=Oe_ZmPOUCNc 
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