Perhaps the other carb was not messed with. It had an extra spring on next to the govenor spring and no cutout spring so someone had been fiddling with it.
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I wound the screw in on it and it was out 2 1/4. So I went with that. But its probably a bit more as Im not sure I could get the screw on the mower done up seated. Using a phillips head screwdriver sort of like a bevel gear on the top of the screw. It wasnt doing the screw any favours.


Pics will explain it.
The slot in the base of the air cleaner housing is a bit forward of the screw.
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I wound the idle screw right in.
The pilot seemed to be better so I wound the idle out until it was idling at a good speed. That was back past where it was. Strange. It will idle and picks up clean to full revs. But it goes past full revs and screams util the choke comes on.
So it will still need a bit more work. I think I might take the carb off again and check the gaskets as suggested. Also tackle the screw again, I think it might need to come out another 1/4 or more. At least I will be able to wind it in and get an accurate count.
The carb should be clean as a whistle inside, I cleaned it out twice back when I was first messing with it.


I would rather not used the grubby carb if I dont have too.
Ive got another GV150 here thats got no carb or exhaust on it, id like to have a crack at getting it going.
Once this motor is running right its getting swapped for a Tecumseh thats on a 19 inch supaswift contractors base.