Yes, page 81 of the Delphi Small Engine EMS Service Manual specified code P0505 as an 'idle speed control error.' I suspect you are correct, and the problem is related to the stepper motor.
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Spud
"Never argue with an idiot. He will drag you down to his level, and beat you with experience." Mark Twain
2015 Zongshen ZS250GY-3 (RX3)
2006 Zongshen ZS200GY-2 (Sierra 200)
2005 Honda XR650L
2004 Honda CRF250X
1998 Kawasaki KDX220
Mods made to my Zongshen ZS200GY-2: http://www.chinariders.net/showthread.php?t=6894
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