I had this exact trouble before, but don’t see my way out, even reviewing old post & replies:
http://www.ppeten.com/forums/viewtopic.php?f=3&t=212
Honda GX200 engine on HS724TA snowblower. Put on new carb.
Engine runs at full throttle regardless of actual throttle setting. Does not over-rev.
If I manually close the butterfly/throttle plate, it goes to idle.
BUT, the co-axial spring on the governor linkage rod (to throttle plate) pulls the plate to wide open if I let go of throttle plate.
I have followed the governor adjustments as indicated here: http://www.ppeten.com/forums/viewtopic.php?f=3&t=212
No luck.
Linkage is in governor rod hole closest to carb.; co-axial spring adjacent (slightly further away) hole.
Do I have them backwards?
Any suggestions appreciated. Thanks
David